Mum has a young yorke which she got from a rescue centre. when she got her she was bald were the centre shaved her matted fur off. she wasnt overly skinny but small. she was constantly hungry and mum was worried about over feeding her so weighed her and weighed her food. as her fur has grown back, she has got fatter and fatter. she also goes through massive amounts of water, about two and a half bowl fulls a day. she has had tests by the vet for diabetes, blood disorders, stones, crystals, everything! the vet has her on tablets at a guess that its thyroid but after a month they are doing didley squat!!!! any one know what is going on?? the vet hasnt a clue and its effecting mollie, she cant walk far like she used to.