The Bug

When a mob like wolf, cat parrot or horse etc. dies you get a death message, but these death messages always get sent to all players even for wolves, cats and parrots. They are only supposed to come to their owner. For horses donkeys and mules it makes sense, because they can be ridden by every player when tamed and don’t have an owner. This also relates to MCPE-35138. Before 1.9, the hasn't been a deathmessage when a tamed mob died.

How to reproduce:

1. You need atleast two players.
2. One player has to tame a wolf, cat or parrot.
3. The tamed mob has to die. 

What actually happened: Every player got the death message.

What I expected: The death message only comes to the owner.

If you for example have two players and both of them have unnamed dogs and one of them dies, the players don't get informed about whose dog died. This wouldn't be the case if the message only came to the owner.