I've noticed Daisy has been tripping up stairs pretty frequently over the last week or so. Normally she has no problems, but lately she has tripped so to speak where her back legs just don't make it on the step. She's also had a couple of problems with getting up on the bed which never bothered her before. Maybe it's just the new comforter (it's a little more slippery for lack of a better word), but the stairs worry me a little. She doesn't show any signs of pain and she's not 2 yet. I'm just paranoid since my last dog had back problems and I first noticed problems with steps.