I have face this problem whenever I have updated my Minecraft.
I have 8 pet dogs and 5 pet cats have been tamed from a long time, I don't usually take them with me, they are always sitting in front of my house and recently when a zombie was attacking me they usually get up and try to kill the zombie but this time they didn't move at all, I right clicked on them to make them stand but none of my 8 dogs' stand and same thing happened with the cats. I am able to feed them food and they even show their heart animation thing (Love Mode). Please help