Affects Version/s: Minecraft 1.11.2
Fix Version/s: None
Environment:Windows 10 x64
Java 8u121 x64
Vanilla Minecraft Server
1. Birth a new wolf and make it sit. Feed it about 30 chickens to speed up growth.
2. Walk two, maybe three, chunks away. A baby wolf should de-render while an adult wolf will not.
3. Wait patiently (about a minute assuming you used 30 chickens). As soon as the wolf grows to adulthood, it teleports to the player and resumes sitting.
I was exploring a cave right under my house when suddenly, one-by-one, about 7 wolves (all with exactly 8 health!) randomly teleported to me and sat in the darkness. This also explains why I find random tamed cats sitting in the jungle around my friend's house.