the concern I have would be the excessive urination issue. Obviously his water intake has increased. This could be due to anything from Kidney problems, to diabetes. Also could be due to a tumor. Has he been wormed lately? If he was just losing weight and no problem with urination I would not be overly concerned. It is not uncommon for senior dogs to actually lose a little weight as they get older. But increase in his urination would cause me to see a vet. Anytime a dog does not do or act as it has done for years is a sign that needs to be addressed. Time for a vet check. Good luck.
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No I am not a Miniature Doberman, I was around 200 years before Louis Doberman created the Dobie and as for my friends the Manx cats, yes they are better at playing fetch than I am, I am a Miniature Pinscher.
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