
((((Gus))))
Have you called your local rescue? Maybe they have her it is worth the call. The same happened with my dog a few years back she was getting old (15 yrs I had her) She was getting sick and then run off one day and I never ever found her, I still think about her.
I hope this isn't the case for you Gus, Our pets are very special to us and you don't sound heartless and your post is not a small loss at all.
Sending you my best wishes and positive thoughts