Sentry Pet Products Reviews

I took my dog to the groomer on July 31, 2026. Since he had fleas, the groomer told me, they had to use flea shampoo, and they used Sentry brand. When I picked him up he didn't seem himself, and he got worse. Lethargic, uninterested in walks, accepting his meals but not eager for them, sleeping all the time, easily tired, super mushy stools. It's been ten days and he's not much better 😟. Now my vet tells me that the poisons in the shampoos to kill the fleas often poison the dog. (And it wasn't even effective at killing the fleas!)

I bought Sentry flea protection for my large dogs at Petco. My smaller dogs I had to get Advantage 2 as Petco was out of Sentry for small dogs. Both large dogs got fleas. My husky mix was worse than my lab. I do not recommend this product as now I am finding fleas everywhere. It’s only been two weeks and the vet said I have to wait another 2 weeks before I can apply anything to the dogs as it has not been a month between applications.

My 7 year old Shih Tzu had a very bad reaction. About 20 minutes after applying as directed he acted like he was in pain, running around, crying, not being able to settle down. Nothing on the package saying anything about what to do if dog has a bad reaction. Had to go online to find out what to do. He was in misery for about 12 hours. Bathing and aloe Vera helped finally, plus I gave him a calming med. I will never use their products again.

Sentry Purrscription was applied to two adult male cats. Both cats lost hair where the application was placed, and are completely bald in the area. That can't be a good sign!

We bought some Sentry Calming collars in May of 2022 for our cat. He was having a rough time adjusting to another cat that was in our home. In October of 2022 he began to have severe trouble breathing and was drooling. My son and I tried to get him to the vet, and he died on my son's lap in the car due to respiratory failure. He was such a healthy boy and had no issues prior to using these collars.

I applied this on my cat as per the directions last night, early this afternoon. I noticed that I could see a bloody spot on the back of my cat's neck…. Immediately ran and washed the product off as best I could. I have used many other products on my cats throughout the years for flea and tick without ever having any issues. I decided that I would try to save a few dollars because money was tight and I needed flea and tick medication ASAP and I have never regretted it more. If you care about your pets don’t take the risk! Honestly, I should’ve come and read the reviews first

No star on this one, purchased through “Chewy”, I’m losing one of my cats, very ill because of this flea med. I put this on my cats just over a month ago & they got worse, especially my older cat, scratching and biting :’(

I googled to check & see Sentry’s effectiveness on tapeworms. I was doing this because I bought Revolution+ as one of my feral babies has tapeworms. After I applied, I realized that this one-stop product doesn’t resolve a tapeworm problem. So, I pulled a box of Sentry that I purchased earlier, and it does treat Tapeworm Larvae! Unfortunately, I have to wait three weeks before I can apply the flea larvae-killing Sentry. Double-checked the ingredients to make sure the box was truthful. Yes, Pyriproxyfen does kill flea larvae. It’s also a medication that keeps flea eggs from hatching using hormones that are not harmful to cats.

I bought this product from Tractor Supply and put it on my very healthy 12 year old black lab. She got very sick. She would not eat. She had diarrhea and could hardly walk. After a several days her hair fell out and she had sores at the spots that I applied the product. I have used other products like this before and have never had a problem. I bought it because it was on sale but would not think that a product could be sold that would make my dog this sick.

My mother put this on her collie mix and when I got home the dog was fine..her normal happy self…5 minutes later…she was lethargic, no control of bowels, vomiting, unable to stay standing. As soon as I put her in a bath a scrubbed the product off..she started to perk up some…I get tail wags again!!! Now she’s on her way to the vet for an emergency visit! Thanks Sentry!! Take your product off the market! Something that’s to help these pets can actually kill them!!!

My poor kitty. Was between vet visits and didn't want her to get fleas. Normally use revolution. She is 18 and has been having arthritis issues. I thought she was in pain from that, just getting worse. Vet didn't see her right away or catch it when she did. Put her on ** for pain, which is also anti seizure. (*thank god!) She had it on for 2 weeks. I bathed her and she looks more herself. DO NOT USE THIS! IT WILL HARM YOUR PET!

These drops were used on my mom and dad's 15 year old healthy cat and she started vomiting, disoriented and refused to eat or drink. She was taken to the vet where she was diagnosed with liver disease which she did not have beforehand. I would NOT recommend this product for any fur baby. IT SHOULD BE REMOVED FROM SHELVES AND THE COMPANY SHOULD HAVE TO PAY ALL VET BILL TO SAY THE LEAST!

Don't use Sentry Fipro Guard Flea & Tick Spot Treatment for Dogs, up to 22 lbs, on your dog. I put it on my Maltese and within one day it killed her. Now I feel like I killed her by putting it on her. My heart is so broken.

We bought these collars thinking they’d be a better option than normal collars. They had them on for 10 days and both of my cats now have burned off hair and gaping wounds on their necks with the worst being under the chin. I’m hoping they heal up and grow their hair back. I only put 1 star because I had to. I wish I could add photos but those will be sent to the company.

Never in a million years did I ever think this would happen to us!!!! My poor puggle is having such a horrible reaction to this product. Very itchy, running around like she’s drugged, chewing her paws, watery eyes... You people should be ashamed to sell this crap to people!!

Almost immediately after putting this on my 6yr old very healthy 29lb dog she started to get very sick. Very lethargic, vomiting. Within days she turned into a complete zombie. We have taken her to the emergency animal hospital and countless vet visits. She is a complete zombie. We may now have to put her down. She’s completely forgotten everything. She has mini stroke like seizure like symptoms. She paces and stares at the walls for hours. She’s lost all control of her Bowels. It’s the most heart breaking thing I’ve ever experienced in my life. Do not get this for your dog.

This brand should be removed from production! Do not buy it! And if you do don’t put it on your pet! If you have, cut it off right away! I bought this from a well known chain pet*****, and it’s not their fault. They sell pet products. I blame Sentry company itself! How dare they produce a product like this! They say all natural! Ha! Yeah right! That’s a load of bull! I put this on my to healthy cats and immediately they started acting strange. I thought “Of course they are acting strange, cats don’t like restrictions “. So I gave it no thought.

My dog had an adverse reaction to this product. She became extremely itchy and agitated. She was unable to sleep and kept jerking awake. Despite two baths the symptoms lasted about 12 hours. She is okay now but it was very scary at the time. The nice thing was that they have a free medical line you can call and speak to a vet or vet tech. Unfortunately I didn't know about it until her episode had ended. When I called the customer service and medical staff were very kind and were able to explain the reaction.

Within a couple of hours of putting this on my 20 lb Dachshund he exhibited signs of having a mini stroke (TIA). He was agitated and pacing, head was lilting to one side, and he was stumbling all over the place. I immediately had to start poison control. 5 mg of **, 20 mg of **, and several baths with blue Dawn dish liquid. I took him to the vet after he was still experiencing the head lilting after 12 hours of treatment and he stated that this is way too high of a dose of the active ingredients, ** and Pyriproxyfen. Treatment was for dogs between 15 and 33 lbs. All this and this was not much cheaper than the Nextguard chewables that I normally get. Will never use this product or recommend it. Pay the little bit extra for the security in knowing that your beloved pet won't die.

Have used this product in the past with no issues. After not using in the winter, I applied to my dog for the upcoming spring. We had a normal, fun and active day. Within a half hour of putting this poison on my dog, she started limping, falling over and yelping in pain. Went to ER and they could only recommend washing it off with dawn soap. Spent another 6 hours at the vet and although vitals and bloodwork is normal, she is still having a severe nervous system reaction to this product. She yelps in pain all night with little use of her hind legs. Going on day two and she’s still not better. Started anti inflammatories to help with the pain. Mortified, heart broken and praying she will recover from this. Will only use all natural after reading all these reviews.

After using this product on three cats and one dog, all seem to have more fleas than when treated. And when I checked to see who the five star reviews are, three out of five had terrible experiences and one of them just said, “we were one of the lucky ones”. Terrible products....

I put this product on a healthy cat that had a few fleas, within a couple of days my cat was infested with fleas. I went from seeing only 1 or 2 on her (is why I used this product) to being covered with them (even had tiny ones trying to get in her eyes when bathing this product off). I was worried when she started to get weak and was going to take her to the vet today but I was too late, my fault for not staying with my normal brand, and she passed last night. Please save yourself from the heartache and stay away from this product. I will never again wander from my normal product again (Frontline). I hope my review is falls in the guidelines so as to be published because I do not want anyone to go through this.

I just noticed my cat's oozing, bleeding wounds around his neck from their collar. And when I say around I mean AROUND. It's not a sore or two. It's one continuous wound. The collar was literally covered in blood and flesh on the other side, almost like it grew into him, except it didn't because it wasn't tight enough. I followed the directions correctly, I bought the right weight.... I have a vet appointment in an hour. I'm guessing it's going to cost me $500 or more to have him treated. He's a big guy too.... close to 30lbs, it's not like he is some dainty, fragile cat. These collars should not exist.

Purchased Sentry prescription flea topical for may cat. I put it on between the shoulder blades. Not even 2 minutes after application she started acting weird and saliva was hanging from her mouth. She hasn't thrown up m... yet.. I tried to wash it off with a dry towel at first.. then a damp towel to try to get some of it off. It was the lemongrass scent. I'm not sure if that is what may have done it, the scent was very strong. This just happened, so I will be watching her throughout the night. I definitely will NOT BE BUYING THIS PRODUCT EVER AGAIN!

I bought the Purrscriptions flea collar for cats and in her correct weight range. Upon opening it the smell of the collar gagged me, and it was slimy to the touch. That should have been a red flag for me. It did nothing to prevent or repel fleas, and the collar burned her neck. She is now raw, and missing about 3 inches in width and from ear to ear on the underside of her neck. She has worn several flea collars over the past several years, and never has this happened. I bought this for the first time at TSC because I forgot to grab one for her at Walmart while I was there. So I bought that one because it was the least expensive one they had. Now my cat is sort of skittish, she isn't always loveable so I didn't notice her burn until several weeks of her wearing the darn thing. The guilt and sympathy I feel for her is immense and I can't stop giving her enough treats. Please do not buy this product. If I could give it zero stars I would.

Unfortunately I did not research this product before I bought it. I put it on my 8 year old cat, who is 12 pounds. All night long she was rubbing her neck along the carpet. I woke up to cat fur all over the carpet ! And she had a big bald spot on the back of her neck where we had put the flea drops. Her neck was oily and greasy too. I did the best I could to get the product off of her. This product needs to be recalled!

I have read a lot of negative reviews on Sentry pet products. Dogs are like people. Some products work on one but not the other. I have been using Sentry Natural Defense flea & tick drops on my Jack Russell/Chihuahua mix dog Jack. He is 13 lbs and I have been using Sentry Natural Defense on him for around 2 years now. for Jack it has been working great. No fleas ever!

Sentry flea and tick doesn’t work! I bought it because it was cheaper. My dog has more fleas now than before he was treated two weeks ago. I’ve had pets for 40 years now and never had this happen. Terrible!

We bought the Sentry Pro XFT for dogs over 61 lbs and applied to my mix (Australian Shepherd-Lab) just before dropping for at a kennel for 3 days. Next morning we get an urgent call from the kennel that our dog would not stand, was shaking violently and vomiting. I immediately call our vet and was told to wash the area with Dawn dish soap. Our kennel did so immediately and then rushed her to a local vet hospital. Within an hour or so of washing off the application, our dog (lucky for us) came around and was soon back to her normal self. Please do not use this product. It should be pulled from the market. The vet at the hospital said that this type of pesticide can go straight to their brain and nervous system.

Yesterday, I applied the SENTRY PurrScriptions med to my 12 yo cat; the poor thing is losing her hair!!! She can't stop scratching where I applied the med and she is going crazy! She's been hiding under the bed all day scratching. I was able to give her a bath with Dawn and I am hoping that I removed all the junk off of her and that she'll feel better soon. Why is this company allowed to sell this product? I bought it at PetSmart. I'm not shopping there again.

I visited my local tractor supply and bought the cat flea three month supply of this product. A few days later my perfectly healthy one year old cat died. I even bought the pack that was recommended for cats 3-5 pounds and she was seven. This product didn't even kill the fleas, just my cat. Please for the love of God, DO NOT buy this product. Please do research before you put any flea medication on your cat. I cannot help, but to feel responsible for my cat's death. This product needs to be taken off the market.

The hair is missing from the spots I put the liquid and I followed as instructed. The spots are bright red and irritated. My poor dog, I will never buy cheap flea and tick medication again. SHAME ON YOU SENTRY. Zero Stars.

This product dog flea collars was a total waste of money. They have been on my dogs for 60 hours. I can still see fleas on both of the dogs. I don't see how you can sell a product and make all these claims and your products not work at all. I wish I had my money back!!! Will never purchase your products again and I will tell everyone I talk to about how they do not work.

This product is horrible. Put the collar on my 75 lb mix breed dog and he is still itching from fleas and I pick ticks off of him daily. I even found a tick directly underneath the collar! This product is a complete waste of money, time and effort.

DO NOT BUY THIS PRODUCT. Within 30 minutes of application, my 50lb husky mix was clearly agitated and couldn't stop panting or pacing. I looked up reviews online and quickly found that this was a common occurrence. My dog's skin was red, his heart was racing, and he couldn't sit still for more than seconds at a time. Three baths with Dawn soap and 7 restless hours later, he's feeling a bit better but still biting at his back. I will never, ever use this again and hope that the product is removed soon. So many of these terrible reviews are masked by a decent star rating, and honestly, I have no idea how.

While visiting my local TSC store I spoke with a sales rep about the Sentry flea and tick collars. Not much help. I decided to purchase a pkg of 2 large collars at $39.98 plus tax. We are not pleased with our purchase, upon opening the collars were very powdery. Once fastened to our dogs they continued to shift/coil. After almost 2 weeks both of our dogs continue to scratch for fleas and we have removed several ticks. I would not recommend this product and say go ahead and spend extra $$ on a better product. Would love my $$ back.

Anyone have any idea how to find/decipher expiration code, if it even exists, on this product? Just a guess at this point - It's probably a masked number, so in the other number, 1056k11, the 105 is probably 105th day on Julian calendar, April 15th. The year? Not sure, guessing 2019 - call the folks at 800-224-7387. Make sure you tell them how idiotic this expiration posting method is, especially as it pertains to the well-being of your beloved pet. You don't see this see this type of encrypted expiration date on human consumption items, why for pets?

I put this on my 16 pound very healthy 9 year old cat. 4 days later she had to be down for neurological issues. I 100% blame this stuff. It’s poison and should not be on the shelves. I am heartbroken and beyond words.

I purchased the Sentry PurrScriptions Plus and in short, my precious furbaby is now gone. I so wish I would have read the reviews prior to purchase and my furbaby may still be here! I can't prove that's what it was, but that was the only thing different (and very coincidental) for my previously healthy 4 year old Siamese. This product NEEDS TO BE PULLED OFF THE SHELVES!!!!

Bought the ointment for our two white shepherds and put in their neck and back as instructed. Problem is... it doesn’t work. After three weeks, our outside dogs are covered with ticks every day. Female sleeps on porch and everyday there are one or two fully engorged ticks that drop off her onto porch. Of course we have stepped on them by mistake and tracked into house. Both dogs regularly have ticks on their eyes and face. Pretty crappy product!!! Never buy again!