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My dog has a rash and is itching. Is it allergies if Benadryl fails?

Updated on September 23rd, 2025

Pet's info: Dog | American Pit Bull Terrier | Male | unneutered | 3 years and 4 months old | 55 lbs

My dog is itching and chewing around is mouth and genital area. He has bumps and pimple like spots on his mouth and a rash on his thighs,testicles, and a swollen bump on the tip of his penis. He also is licking his paw and it look a like he chewed skin of of two paws. Is this an allergic reaction. I'm giving him Benadryl and it is not working. I am low on money and can't afford vet visits and I don't know what to do. He is miserable and this has been going on for a few weeks and getting worse.

1 Answer

Most Helpful Answer

Anna M., DVM

Answered By Anna M., DVM

Veterinarian

Published on July 18th, 2017

These symptoms do sound likely that Nino has allergies. If it has been going on for weeks and is getting worse, he likely has seasonal/environmental allergies. Unfortunately over the counter allergy meds such as Benadryl don't work all that well, and he really needs something more effective to control his symptoms, which would need to come from a vet. The pimples you are seeing probably indicate a secondary skin infection which will need antibiotics to clear up. So, he will need a vet visit to improve. In the meantime you can keep those areas clean and dry; I recommend bathing him with a mild oatmeal based shampoo and drying him thoroughly. You can also wipe down his feet and muzzle with a damp cloth when he comes in for the night to get as much pollen, grass, and other allergens off him before he goes to bed. Hope this helps.
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