I have two cats, one a 12 year old who we keep in at night and another one, aged 4, who is an absolute bugger at bringing home mice (very much alive) and letting I loose in the living room. He's brought in at least 6 in the last month and it's a right faff trying to get them out. He has a little hut outside that he sometimes sleeps in, so I've suggested to DH that if he's still out when we go to bed, we should lock the cat flap so he can't get back in. I just don't want to have to go on yet another bloody mouse hunt!! DH thinks it's cruel but as I pointed out to him, he often chooses to sleep outside in his hut. Would you lock him out?