Very annoying sitting glitch with tamed cats and dogs

What I expected to happen was...:
The tamed dogs and cats to stand up when i right clicked them

What actually happened was...:
They stayed sitting down.

Steps to Reproduce:
1. Get a dog or cat and leave them or sit them (it works both ways)
2. Leave for a few hours and play a different world
3. Come back and they are sitting down and never come back up