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My dog won't eat, has bad breath, and licks after flea/tick meds.

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 2 years and 11 months old | 55 lbs

My dog (55lb) shepherd mix hasnt eaten and all of a sudden has terrible breath. Noticed after I gave her chewable flea&tick and heartworm meds 2 days ago. No change in medicine so not sure why that would cause an issue. Temperament and personality seems fine. 3 years old. Has been licking a lot as well.

2 Answers

Most Helpful Answer

Ana M, DVM

Answered By Ana M, DVM

Veterinarian

Published on October 12th, 2018

Thank you for submitting your question regarding Lyla. I recommend that she sees her veterinarian. She could have an infected tooth or a wound in her mouth contributing to the oral pain and bad odor. A thorough exam will be performed to attempt to identify her problem. From there, a treatment plan can be developed. In the meantime, you can soften her food with warm water or offer canned food to make it easier for her to eat. Do not give any over-the-counter pain medications as these can be toxic to dogs. I hope this information helps!
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Related Answers from Veterinarians

  • Answered By Linda G, MS, DVM

    Veterinarian

    Hello. Licking & loss of appetite are classic signs of nausea, but what may be causing the nausea is a more difficult issue. It may be the medications you gave 2 days ago. Depending on the products, the new recommendations are to separate giving oral flea & tick from oral heartworm meds by 2 weeks. They should never be given together due to the potentiation of side effects. If Lyla does not want to eat by tomorrow, or develops any vomiting or diarrhea, please see your veterinarian as soon as possible. Thanks for using Petco Pet Education Center, formerly Petcoach.

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    1Pet Parents found this answer helpful

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