Tamed dogs will despawn on LAN worlds

On my LAN world, my tamed wolves despawn whenever I come back to my house.

Describe what you thought should happen here
I thought they would wouldn't despawn.
What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Tame some dogs and put them in your house
2. Stay around them for a few minutes
3. Go away, out of the chunk, for about 5-10 minutes