Hi all, I'm new to this forum. My 2.5 year old male lab just started showing a decent sized bump on his back, right above his right thigh. I noticed it last Friday. Since then, it has gone down a bit, but it's still noticable. I can't figure out how he got it. His sister (1.5 year old collie mix) plays rough with him, but we've never seen any scars or bumps. Could he have just knocked into a door or something? How long do accidental bumps last? Since it's been almost 4 days, I'm starting to get worried. He hasn't complained or started limping or anything... in fact, even when I run my hands over it, he doesn't flinch. So I don't think he's in pain... I just wanted to know if it's serious enough to get him looked at. Thanks!