My dog has not been quite right for a week. She eats fine, and is her usual happy self, but she cannot jump up on the bed or the couch. I noticed the other day she yelped when I squeezed her back end, where the kidneys might be. I thought I noticed a little light red blood in her her urine as she just peed on our bed. I was thinking it was a pulled back muscle but I'm not sure now..any ideas? thanks!