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My dog is throwing up. How to tell if he's dehydrated and what to do?

Updated on September 23rd, 2025

Pet's info: Dog | Lhasa Apso | Male | neutered | 18 lbs

My 13 yr old Laso Apso has been vomiting quite frequently for the past 12 hrs. I don't believe he ate something that he shouldn't have. He did not sleep at all lastnight. He was panting very hard lastnight but has stopped that now. I'm worried he will become dehydrated. How can I tell if dehydration is occuring? And is there anything I can do to stop the vomiting?

1 Answer

Most Helpful Answer

Jessica Keay, DVM

Answered By Jessica Keay, DVM

Veterinarian

Published on June 22nd, 2017

In dogs, we can sometimes tell dehydration is present if we look at their gums and they seem dry or tacky instead of wet/covered in saliva. In some cases we can also see what is called "skin tenting" where if we pull up the extra skin between the shoulder blades and release it, it doesn't immediately snap back into place. These signs, however, occur with severe dehydration. If your dog was vomiting repeatedly for a day, he is likely dehydrated. He should go to the vet for an exam, fluids to rehydrate him, and an injection to help stop the vomiting. They may recommend testing (x-rays and bloodwork) to try to determine the cause of vomiting to more accurately recommend treatment.
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