Updated On October 26th, 2023
Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 2 years and 6 months old | 70 lbs
Answered By Dr. Strydom, DVM 105
Veterinarian
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Hello, thank you for using PetCoach. This lump is most likely a histiocytoma. It is a benign tumor that is found frequently in young dogs. It will often regress on its own with no treatment within a couple of months but you can sometimes make it go away faster by giving Benadryl. Here is a link to an article about histiocytomas: ( https://vcahospitals.com/know-your-pet/skin-cutaneous-histiocytoma ) If it is not bothering him at this stage you can either do nothing and monitor it or you can give him the Benadryl and monitor it. If it doesn't go away within 6-8 weeks then have your vet check him out. Benadryl dose for a dog of Rip's size would be 2-3 of the 25mg capsules/tablets twice a day. Dogs take a much higher dose than people do so don't be alarmed at how large the dose is. You can use generic (diphenhydramine) which will work the same. ( https://www.1800petmeds.com/diphenhydramine+%28generic+benadryl%29-prod10834.html ) Of course, if you are worried there is no harm in having your vet check him out in person. Hope this helps. Best wishes.
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