Tamed wolf's health depleted upon world loading

I load Minecraft snapshot 13w24a, and enter my multiplayer map (I run the server). I have a doghouse (5 wide, 5 long, 2+ blocks tall) next to my "house". Upon the world loading I can hear the dogs whining, and when I check on them all 6 have their health depleted to the point where it takes 3 zombie meat to heal them back to full health. Also, I leave them sitting in the dog house, but when I load the map they are all standing and in my "house". I have been the only player on the server today.

What I expected to happen was...:
My dogs are the same as I last left them - sitting in the dog house, with full health.

What actually happened was...:
They are teleported to my house with their health greatly depleted, whining.

Steps to Reproduce:
1. Start Minecraft snapshot 13w24b
2. Load map
3. Listen to dogs whining