It is never easy to lose a four-legged family member. It is difficult right now, but take a great deal of solace in the fact that he had a great life and this is not a given for dogs. My wife volunteers for a number of animal rescue organizations, and many times there are many companion animals that die painful or lonely deaths, and they are neither loved nor noticed. You are a good person for stepping up to adopt and when the time is right you can do so again. Take care and condolences on the loss.