What is the best thing to do with my old dog?

I have a 12 year old cocker spaniel. He has been a great dog, but now he is having lots of medical problems that are costing me way more than I can really afford. Plus, he is of course way past his prime, and doesn't do much of anything any more. I don't have room for two dogs, but I want a puppy or young... show more I have a 12 year old cocker spaniel. He has been a great dog, but now he is having lots of medical problems that are costing me way more than I can really afford. Plus, he is of course way past his prime, and doesn't do much of anything any more. I don't have room for two dogs, but I want a puppy or young dog that will be able to do something more than lay around and cost me money. What should I do with my cocker? I want what is best for him. Should I consider having him put to sleep? Or would a shelter be better for him? Thanks for the help.
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