Tamed wolf becomes untamed when i log off

    So i logged on to Minecraft one day and decided i would tame two wolfs, everything was going fine till me and my friend got tired and logged out of Minecraft.  A day later i got back on by myself and tried to make my dogs follow me, they wouldn't, so after a while of trying i had accidentally hit one of them, the tamed wolf started attacking me like it was untamed which i thought was weird since there not suppose to do that. They wouldn't even follow me. my friend also tried to make them sit up or follow him but still nothing. I went in some of my other worlds and saw the same stuff started happening there, I also noticed it only happens when i log out. This has bin going on for more that a week please get a fix for this as soon as possible. 

Two more thing I also want to say, i can still feed my wolfs to get there health back up but can't retame him and they look tamed but don't follow, sit, or attack a mob if i hit it.

There is also a picture of one of the dogs not following me and another of him attacking me

thank you.