Mason (maltese/toy poodle) keeps licking and sniffing his bottom. It's more than him just cleaning himself, it's almost obsessive. He goes to the groomer every 4-6 weeks and from what they tell me they express his anal glands everytime he gets groomed. He is perfectly fine otherwise and his poop is normal. Last night he was laying against me and I had on a white t-shirt, and when he moved there was a small light brown circular stain on my t-shirt. I'm not sure what to do and I haven't called the vet yet. I thought I would try here first.