I am very sorry for your loss. We were there just a few months ago. Solo has never been by himself. We lost Rusty very quickly, within hours of coming home from work one night. Solo didn't know what was going on and never had the chance to say good-bye. I literally threw a handful of treats at Solo and ran out the door with Rusty. Rusty did not come home that night. Solo had no idea what happened. That was on a Tuesday. Solo did not eat until Saturday while he was at the dogsitter since we were going out of town. Being with them and there greys seemed to have helped. But when we got back, he was very sad. He was not himself and I would find him laying on Rusty's pillow a lot. Eventually, he got through it and he is fine now. It just took time for him to realize he was alone and adjust to that. Solo too had never been alone, even when he lived with another family previous to us. But he has adjusted and he is doing fine. I hope Wally feels better soon. I'm sure he knew Hobbs was sick. He's mourning in his own way.