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Is my dog vomiting from a higher dose of Trifexis after spaying?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | spayed | 6 months and 17 days old | 9.8 lbs

My 6 month old cavapoo has been taking Trifexis since she was 3 months old without any reaction. She was spayed on August 2nd and weighed 9.8 lbs. I purchased the tablet at that time. This one was for 10-20 lbs which is the next one up from the pink 5-10 lbs she had taken before. She threw up some of her food last night and wouldn't eat this morning. She just threw up again. Is this due to the higher dose of trifexis and when should I become worried? (Like I'm not already)

1 Answer

Most Helpful Answer

Answered By Ana M, DVM

Veterinarian

Published on August 19th, 2018

Thank you for submitting your question regarding Fiona. She is unlikely vomiting from the Trifexis if she hasn't in the past. That is a small dose change for her. There are numerous causes of vomiting such as dietary indiscretion, an infection, stress or something more serious such as eating a foreign object. If she still refuses to eat or cannot keep food or water down, then she will need to see a veterinarian today. Being such a small breed dog, it is easy for her to become dehydrated. If she seems to be feeling better, give her small frequent amounts of water and food throughout the day today. I hope this information helps!

1Pet Parents found this answer helpful

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