Within the last two weeks, my 1 1/2 yr old has started chewing the tops of his feet. The knuckle area of his feet are completely raw. We have an older lab that has allergies, but he chews the bottom of his feet & his belly gets hot spots from time to time. I haven't seen him chew the top of his feet. Is is possible that this is allergies? He isn't chewing or scratching anywhere else. What can we do to ease his pain? Any thoughts or suggestions would be great. Thanks!