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Ask Dr. Michael Salkin Your Own Question
Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Veterinary
Satisfied Customers: 30398
Experience:  University of California at Davis graduate veterinarian with 45 years of experience
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My dog has a clustereo sore bumps at the elbo. while now s

Customer Question

My dog has a clustereo sore bumps at the elbo. For a while now his leg is swelled up down to his paw larger than the right one loss of appetie look sad. He's been with me for 16 years. I've gave him penasilin for humans I'm not near a vet
Submitted: 1 year ago.
Category: Veterinary
Expert:  Dr. Michael Salkin replied 1 year ago.

Fred, can you upload a photo(s) of these sore bumps to our conversation? You can use the paperclip icon in the toolbar above your message box (if you can see that icon) or you can use an external app such as

I'm concerned that they represent mast cell tumors. When mast cells degranulate (the granules inside them break open) they release histamine which causes swelling as you've described. This doesn't respond to penicillin but might respond to a glucocorticosteroid such as least temporarily. An antihistamine such as diphenhydramine (Benadryl) dosed at 1-2mg/lb (maximum of 50 mg at any one time) might be palliative but not expected to be as effective as prednisone.

The swelling may also indicate lymphedema - lymph vessels congested with malignant cells from a tumor elsewhere in Ben's body or from the elbow area.