Pet shop about an hour away from me. Manager hadn't been in there for ages (or maybe didn't care, dunno.)
All the puppies, kittens and birds were sitting in their own poo, most had no water and some containers had rotting food in them. The fish tanks were all riddled with disease. I couldn't bear to stay there very long but I noted ich, columnaris, fin rot and dropsy. The tanks were filthy, dead decomposing fish everywhere, stuck on filters, being eaten, floating etc.
A guppy with an L-bend in it, screwing through the water in convulsions, unable to swim. They wouldn't even put it down.
I've seen the throw fish in a bin/bag to suffocate instead of euthanising them humanely as well. Ridiculous - I mean, a bowl of water with a drop of clove oil lasts two days. Clove oil isn't cheap but you need so little of it that it's well worth it. You only need to anaesthetise the fish, then if you chuck it in the bin it just dies and doesn't feel anything.
Oh and I was on holiday and they had this hole in the fish tank shelf with a cup resting on it. They just chucked the dead fish through the hole into the cup. There were fish that had been there for several days, it was crawling with flies and maggots and some of the dead fish had landed on the bench and dried onto it. It was disgusting, I almost puked. Eeew.