Our local P@H hasn't had a load of gPs the last couple of times we've been there (DD and I try to avoid it TBH)
But in the times we have visited I've seen (Not at the same store though)
A very chubby sided GP in with the males (The pregnant look they get, not just all-over tubby). I did say "That's a pg female" and they said she would be moved. (I'm presuming she wouldn't be sold. Poor thing was just a baby herself. I've bought a pg female years ago who had a single piglet. Piglet never got very big but we had her 5 years)
A GP with a very scabby looking chest- no sign blood but maybe the start of something. Ringworm? Self barbering?
A GP (well actually 2 but one was ok when they caught it) with a closed eye. They took it off to bathe its eye "Maybe its sleepy" they said.
"Erm no, it's eye is stuck shut "
I said.
I'm only looking at GPs. I've got no ideas about rabbits, hamsters.
There seems to be a continual conveyer belt of new babies, so the once out of their Cute-By-Date get shunted into rehome 
And Gumtree GP sellers send by bloodprssure soaring 