[Ringo1]

I'm sure your decision was made out of love and, therefore, was the right decision. I felt guilty for a long time after putting my maltese to sleep ~ he was in much the same condition as your dog. Deaf, blind, incontinent, and senile. Yet, he didn't have a life threatening illness . . . so I felt super guilty and second-guessed myself for a year. But his quality of life was awful and even my vet thought it was the right decision.

Try not to allow guilt into your grieving process. You did the final act of ultimate kindness.