I recently noticed that my 1 1/2 year old wheaten terrier was limping when I was walking him today. When we got home I tried to look at his paws and he wouldn't let me. He just kept licking it. When he fell asleep I took a look and noticed that the big pad on his front right foot was missing the top layer of skin. It look like it was scraped off. There is still another layer of pad underneath but i'm assuming it is very tender. His other ones seem to be tender as well but are not torn or anything. Could this be from walking him while the pavement is hot? He loves to go for walks and goes on 3 or 4 a day between the 4 of us. Ranging anywhere from 10 to 45 minutes. Should we not walk him as much? Is there anything we can do to stop the pain in his paws?