My B does it occasionally. What's even more weird, when he's laying in the sun he likes to extend his arms out and rubs his paws together. Tough to explain really, but it's quite comical. I originally though it was an allergy but there's no evidence of any problem.
Thanks all for the responses. I was just curious 'cause I'd never had a dog or known a dog that did this. Someone told me it could be allergies. But with the responses here and the fact that it is only an ocasional thing, probably not. Just a new dog thing I never knew they did.:) Didn't know cats did it either!