I noticed Theo limping on his front leg the last few days, nothing consistent though. He also started giving me trouble on our walks, planting his feet and not wanting to walk, that sort of thing. I finally noticed what I think the cause is: some kind of growth on his foot pad.

I don't even know how to describe it. A callus? A blister? It's a small growth on the side of his pad, under the fur, on one of his middle toes. It's hard, but it's definitely a growth. It doesn't seem to cause him pain because he didn't cry out when I inspected it, but it obviously causes him discomfort because of the limping and refusal to walk and the fact that he kept trying to pull his foot away from me when I was looking at it. We have puppy class tonight so I'll try asking the trainer if she knows what it is. So far I'm guessing it's something not serious that just needs to heal.

I was wondering if anyone knows what it might be, and how I might help it to heal.