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My Jack russell/Whippet Cross, Monty is a neutered male. In the past four months he has aged considerably, with disc problems. He now mainly sleeps and doesn't eat or even drink very much. He looks very old. He is very thin, even noticeable with him being part Whippet he has always been lean but now he is ribby. He has a dog door and has always used it but now he is weeing on the carpet when I am out. Do you think he sort of has dogzeimhers? He is looked after by our vet anI am trying to catch some urine so it can be tested. When Monty had the spinal problems he was anaesthetised for exrays and blood and urine was taken. There was nothing untoward. How do I know if it might be kinder to have Monty put to sleep?