I am so sorry to hear these sad stories. They both sounded like amazing pets. I hope you don't have as much bad luck these days.I grew up on a large cattle grazing property... I've lost far to many dogs. More than someone my age probably should have... so pretty much all of my stories revolve around death. One of the sadder ones was about one of our pups Maddie. I had given her a bath a day earlier and for some reason I didn't take her collar off when I did it. Anyway that day we were sitting out the front yard and I was trying to get her to walk up the stairs, she wouldn't go and I thought she was just being silly so pulled her up to the top (I was only young and stoopid lol) anyway when we got to the top I realised she couldn't actually move her back legs. Turns out that she has a paralysis tick under her collar that if I had of taken it off of her when I bathed her we would have found it. By the time we had discovered the tick it was too late, since we didn't have much money we couldn't take her to the vet so had to watch her suffer. The saddest thing was leaving for school on her last day knowing that was the last time I would see her alive.
Another one, we had a Stafforshire Bull Terrier named Jarrah, he was a gorgeous but crazy little boy who would sleep on my bed every night with me. He went missing one day, we thought he must have been stolen. Some time later I was walking through our paddocks and could see something black in the distance, at first I didn't think anything of it but thought I should go and see if it is a kangaroo or something. It wasn't and turned out to be Jarrah. We aren't sure what killed him but there was a bitch on heat on the next property over so we thought he must have been going for a wonder. He was one of my favourite dogs I have owned.