All four of Buster's paws appear swollen today. He is licking them quite a bit, but doesn't appear to be in pain (i.e. he keeps prodding me for his walk). They look somewhat reddened between each toe. The main part is the swelling. I'm wondering if anyone has an idea what it might be before I haul him off to the vet. He hasn't been walking in any weird areas, although he did go canoeing about seven days ago and had to walk through all kinds of who knows what!