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Why is my senior dog vomiting, having diarrhea, and collapsing?

Updated On September 23rd, 2025

Pet's info: Dog | Beagle | Male | unneutered | 8 years and 8 months old | 40 lbs

Hello. I have a beagle, he is 8.5 years old and has been vomiting yesterday and had diarrhea. That continued this morning, but later in the day his appetite was back and he ate some light food. What concerns me is that he started falling down, like he faints for a moment and comes right back up. That happened few times today and yesterday. What could be the reason? Thank you

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on September 11th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! Vomiting and diarrhea can be observed with conditions such as gastroenteritis, pancreatitis, dietary indiscretion, gastrointestinal foreign body ingestion and obstruction, among other possibilities. I am afraid that these episodes of weakness are caused by severe dehydration. For this reason, I highly recommend that you have Leo evaluated by a veterinarian for further assessment and treatment as soon as possible as I am afraid he is likely becoming dehydrated. They would be able to check for these possibilities and also check his hydration status and give him medications to make him feel better. Good luck!

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