Hmm... Why do people watch dramatic movies where the main character dies a slow, horrible traumatic death from cancer? Why do people enjoy war movies where you see the bloody deaths of thousands of people? Sadly, because it's entertaining. Personally, I don't give a rats ass about cartoon dogs when you look at the fact that by the time I die, I'll have seen 1 million deaths from movies and television, or whatever the statistic is.
In my humble opinion, the point was to create an entertaining show. If you want to dig a little deeper, the episode painted a nice picture of loyalty and friendship.
The dog was emotionally
suffering, not being beaten with a baseball bat. I just don't see what the big problem is. I would complain about shows that show the murder and torture of people before getting upset about a mutt that lost his master.
That said, I did cry at the end anyway.
Oh, and welcome to PEEL.