Hello,
I would agree with you the feet are likely infected, and because this is seasonal related, I don't see a need for a biopsy. When the condition gets this bad uncontrollable by antihistamines and steroid injections, your best bet is to seek a dermatologist referral from your vet so that you could have customizable injections made up for your dog to control these allergies. A biopsy will likely prove no help in this matter.
Instead of antibacterial soap, i would use a betadine (iodine) or chlorhexidine solution mixed 1 part to 10 parts water to soak the feet 5 minutes at a time, 2-3 times a day, and pat dry very gently but thoroughly. Covering with booties may be needed to help prevent additional trauma to the raw areas and an e-collar a must while healing up. Oral antibiotics are also required to help prevent systemic spread of the infection. This is a severe case, but not an uncommon one, and I do think if further action is to be taken in dealing with your dog's allergies, a dermatologist is your best bet to have the best experienced person dealing with this which ends up being much cheaper and faster relief for the dog in the long run.
Good luck, and hope he heals up quick.
christine
__________________
Christine M. Peterson, Licensed Veterinary Technician (NY)
Please click ACCEPT if I have answered your question. Positive FEEDBACK/ BONUSES are greatly appreciated. I strive to help you and your pet; No info on Just Answer can give a diagnosis.
