My 14 1/2 week old giant breed was playing with my parents' GSD yesterday. When I went to pick him up, they were concerned about a lump on his rib. It is visible when he's standing. If you feel it it's about 5-8cm of rounded rectangle bump directly on the equivalent of the lowest rib on a human, about 1/3 of the way up his flank from the bottom. You can massage him heavily and there's no pain or discomfort. He hasn't displayed any symptoms of pain or feeling unwell, which makes me doubt there's a break. I would've guessed a bruise, but if I get one it hurts like hell and again, he's not bothered in any way. If it was a human I'd be worried about a broken rib, but with that I'd associate breathing difficulty and intense pain with any movement. Anyone got any ideas and whether it warrants a vet visit or if I should just watch it for a couple of days?