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Hi, all - I'm really grateful for your support on this. He was put down yesterday morning. My vets are very kind and he wasn't stressed at all. It's a shame to have had to do it, but ultimately I think it was for the best. If I could have tamed him and if he hadn't been so aggressive, I would certainly have given him a home with us as I hate to have to destroy a healthy animal. Thing is, I'm now wondering if he could've been Mischa's dad. She was found a couple of miles from my farm and her mum had probably mated with a feral. Mischa, although she is pure black, has faint tabby markings on her head (in grey!). If Mr. Nasty was her dad, at least he's left a legacy and his daughter is being well cared for (she's a little monster, just like him, so I wouldn't be surprised!! But I love her...).