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My 10-week puppy is hacking and sick. Why isn't Benadryl helping?

Updated On September 23rd, 2025

Last evening, my 10 week puppy started hacking like he was going to throw up but didn’t. He was up almost all night hacking. This morning, he wasn’t interested in eating breakfast; took him outside and he had a smaller than usual bowel movement. He hasn’t been playful at all today, just wants to sleep. He ate lunch & dinner fine, but still no bowel movement. I called the vet today and they advised me to give him 8mg of Benadryl & again in 8 hours.. both are done. He’s still hacking.

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1 Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on May 8th, 2018

Your puppy is so cute! I'd give the vet a call back to make an appointment for him. It could be he has a respiratory infection causing his hacking, in which case Benadryl won't help. I wouldn't be too worried he had a smaller than usual bowel movement and hasn't had one since. Sometimes the bowel movements can be smaller, and it's good he's gone at least once today. Give the vet a call back to have him seen. Best of luck.

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