Cimorene

I lived with dog breeders who were mostly ethical, but they had this one bitch who had really perfect conformation - top show quality. Unfortunately, as she got to the age for breeding, she started having brain seizures where she'd act rabid and wild, trying to tear anyone apart. She had to be caged almost constantly because nobody could tell when the next bout would happen. It was daily, at least.

Alas, the co-owned the dog with another owner. The dog needed to be put down for real. She was a risk, and selling her puppies (big bucks!) was completely unethical. Responsible breeders would never have bred her. As it was, the other owner insisted that she not be put down, and the other owner bought out their share, and the dog went away.

I was furious about the whole thing.