My condolences. It's never easy to lose a beloved pet.

I wouldn't hide my grief, I think discussing your own grief will help you both. My question would be if you want to explain putting the dog down (Animal euthanasia). My DS15 & I had a unresolved discussion/argument about animal euthanasia a few weeks ago. He really felt it was never OK to euthanasize an animal. It wasn't an easy discussion and at the time we didn't have a sick pet at this time. I don't remember why the subject came up.