Do they have a smell of anykind that isnt quite normal? If they do, they may be infected, due to something else. Jack's pads used to split and become very hot and smelly. First it would be one paw for about 4-5 days, I would get that cleared up and it would happen to another paw right afterwards. No one could tell me want was wrong with him, but it doesnt happen anymore so I cant tell you what it was.