I just noticed Lucy's left thigh is red and swollen. There is no cut or blood. There is a little strange "sac" that is lumpy. It looks like a bruise but the sac kinda freaks me out. She is being her usual self and is eating and wants to play. She seems to be walking normal, maybe a little stiffer but not much. The vet won't be opened until Monday, just wanted to get your advice. Is it just a bruise? I've never seen this before...Thanks for your input.