Sniffer's head occasionally glitches

The Sniffer's head occasionally glitches. This is purely a visual glitch and seems to happen randomly.

Steps to Reproduce:

1. Acquire a Sniffer spawn egg

2. Place a sniffer

3. Watch until you see the head glitch (It will flicker into a different position then back)

Observed Results: 

The Sniffer's head occasionally glitches

Expected Results: 

The Sniffer's head shouldn't glitch and should work like all the other mobs animations