Hannah, I'm so sorry you had to go through that. We went through something kind of similar, so I can sort of relate.
If anyone gives you a negative comment, just ignore them because they have no idea what it feels like and they have no idea of what it means to do what is best for the dog.
I'm sure that was a hard decision for you, because I know how much you love Thor.
I'm sure that its still a tender spot for you, and it still hurts. I'll keep you in my prayers and if you ever need to talk or anything, my PM box is open.
Hugs!
I'm glad that he is happy and content with Grandma and Grandpa.