My dog, he's about 2.5 years old, licks himself every night, beginning at about the same time, for 3 or 4 hours straight. Does anybody know why he does this? He's neutered and we don't have any other pets. We walk him every day for about an hour, oftentimes in the early evening. H'es been doing this for the past few weeks. Does anybody else's chihuahua do this? Thanks for your help.