My 4yr old spayed Labrador has small round red patches on her skin, and a nipple-like lump on her foreleg. She is always licking and chewing her paws. We first thought it was a grass allergy because it usually presents itself in the summer for a few weeks. But this time it's been more than 6 months. She's tried antihistamine, steroids and antibiotics. The only thing that helped was the antibiotic but she started chewing again once they stopped. The steroids only made her ravenous, enough to make her steal food. The latest thing we tried was changing her food - from hypoallergenic salmon and potato to hypoallergenic lamb and rice. If anything, it's worse now. The red patches are all over her belly and through her skin on her head. She's been shaking her head a lot lately too and I checked the ears tonight and there's red patches there too. She chews her paws so much that she hurts herself and yelps. We're taking her back to the vet this week, do any forum members have any advice as to what I should ask? Anything else I should try? Thanks...