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Chihuahua's neck red from flea collar. Is it an allergic reaction?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | unspayed | 7 lbs

I put a Sergeant dual action collar on My chihuahua yesterday. Today her neck was red and was wining. I took the collar off and washed the dog very well. Could she have a allergic reaction to the collar or the chemical it is made out of. Is there anything else we can do?

2 Answers

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on April 14th, 2018

It is very likely that this is an adverse reaction to the flea collar and you should leave it off, You can get a spot-on like advantage or Frontline for her or give her a Nexgard or Bravecto chewy, which will work for a few weeks. All of these are available at your vet's or over the internet, possibly in a pet shop. You did well by washing the neck. This should have removed most of the collar-ingredient.

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    Answered By Lauren Jones VMD

    Veterinarian

    Published on April 19th, 2017

    Ouch, poor Belle! I'm glad that you took the collar off immediately. If you haven't already done so, bathe Belle as soon as possible with an oatmeal dog shampoo or gentle baby shampoo. The bath and removal of the irritation may be enough to stop her reaction. If the irritation continues, you should seek veterinary care for Belle, as she may need antihistamines or corticosteroids, or even antibiotics if she itches and causes a skin infection. Also call Bayer (the company that manufactures the Seresto collar) to report this reaction. Their contact information should be listed on the packaging. Once she's feeling a bit better, consider giving Nexgard, Bravecto or Advantix for flea and tick prevention. I hope that Belle is feeling better soon!

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