hi my border collie is nearly 11 , have noticed the last week he has been drinking and weeing a lot,its not like wee its colourless and has no smell , he wakes me every night to go out , lost a bit of weight ,which he could do with as he was fat , eyes have a blue tinge , got a few little lumps round his neck,and a few big ones on his side , other than that seems alert , happy , still eating the same just slower, do you think its worth a vet visit or just old age stuff kicking in ?.