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  Sparty sounds like he had a wonderful life.  No one can tell you the right thing to do; only yourself, Sparty, and your trusted Vet.  If your actions come from love - then whatever you decide will be the right decision.
 Most of us have been where you are at some point; it just seems to come with dog ownership.  It's the hardest part.
 
 Peace be with you in this most difficult time.
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