Wolf's tail will spin 360 degrees if max health is increased

The bug

Normally, a (tamed) dog's tail will move up when it heals. If a dog has more health than it's supposed to and it heals more, the dog's tail will move in a circle, into itself and back out. 

How to reproduce

1. Get a tamed dog
2. Give it tons of health with a command, such as:

   /effect give @e[type=wolf] health_boost 999999 100 true
   

3. Start splashing it with instant heal 2 splash potions

Code analysis

Code analyses by [Mod] Avoma, [Mod] ampolive, and [Mod] tryashtar can be found here, here, and here.