Why is my dog peeing less after taking Benadryl for allergies?

Her behavior could be from the Benadryl but I doubt it as you gave an extremely low dose of it (I'm assuming you gave 1 tablet at 25mg - not 0.25mg). Benadryl is metabolized very quickly by dogs so they need a very high dose. The dose is 1mg per pound of body weight so she would have needed around 65 mg (so you would have to give 2 or 3 of the 25mg tablets for it to help much). You can refer to this information sheet about using Benadryl in dogs. ( https://www.petplace.com/article/drug-library/drug-library/library/diphenhydramine-benadryl-for-dogs-and-cats/ ) If you are worried about her behavior you should take her to the vet for an exam.

I am assuming you have a 20 mg or a 25 mg Benadryl tablet that you cut in half. So if anything Jon Snow would have received possibly 2-3 mg more than he should have. This is a relatively small overdose and I don't suspect it will cause him any problems but you should monitor him for lethargy/sedation, inappetance, vomiting and diarrhea. If he becomes extremely lethargic or shows any Gastrointestinal side effects he should be seen by a veterinarian as he may need supportive care. If you think he received more than a few milligrams over his appropriate dose of 10 mg then he should be seen by a veterinarian right away just to be safe. Thanks for using Petco Pet Education Center, formerly Petcoach and I hope Jon Snow does not have any ill effects!

While it is not good to overdose on Benadryl, your dog will likely not have any ill effects from a 25mg tablet. Pete will likely have a good night´s sleep. Should he show abnormal behavior or seizures, he needs to be seen by a veterinarian or at a Prt ER for supportive care.

Thank you for submitting your question regarding Misha. I typically recommend giving Benadryl at 1mg/pound. So I would give around 12mg orally every 8 hours. The dose you were told is a little high, but probably still reasonable. Antihistamines are a somewhat hit and miss in dogs. They will help some dogs, but not others. If you do not see an improvement in the skin around his eyes, then he will need to see his veterinarian. He could have a food allergy, for example, as this commonly affects skin around the eyes. In these case, the dog may be experiencing vomiting, diarrhea or an increased number of bowel movements per day. These dogs can also have skin issues elsewhere and are prone to ear infections. I hope this information helps!

Unfortunately, by law it is illegal for the experts at Petco Pet Education Center, formerly Petcoach to give the dose information for any drug, including OTC drugs, without seeing the animal in person first. That's because doing so requires a veterinary client patient relationship which cannot be achieved via an internet forum. In addition, the experts cannot say for certain if a specific drug is safe for your dog. You need to check with Chewy's vet to see if it's safe to give him, and the vet can give you the dose.

I believe it might actually be part of the original allergic reaction but as there is suspicion he had a reaction to the Benadryl i wouldn't recommend giving it again. instead i would recommend to monitor him, give it 48 hours, if it is not resolved bring him back to the vet for a steroid shot.

The calculation for Benadryl is quite simple, it just 1mg per lb , so for a 5 lb dog it would be around 5mg. Since Benadryl comes in 25mg usually this is close to 1/4 tablet and there is a wide safety margin for Benadryl so 1 or 2 mg above or below is well tolerated. Expect some drowsiness just like in humans.