Quality of Life. If he's happy and not suffering, then let him be. If he's in pain or somehow not enjoying his life, then it's time. Often it's best for you and him.
My childhood dog, a 12 year old Lab mix, began having bloody discharge from both ends. Cancer. We put her down. My 13 year old cat, who I thought was the healthy one, suddenly had a hunchback one day. Cancer again. I had the growth removed but it came back. He got to where he couldn't walk and it was his time.
You should be able to tell when it's time.
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People Are Stupid. People can be made to believe any lie, either
because they want it to be true or because they fear that it is.
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