This is very helpful!! I will not give her aspirin and I agree with the posters who said it's either her allergies or a bad habit. She does not have any inflamation in her pads, but I will check again. Since she generally does this in bed,whether we're taking nap or at night, I do think much of it is a habit. I will work on correcting her. Right now, she's happily chewing her Greenie and her paws do not seem to bother her at all!