I had a group of tamed wolves that were sitting down. I hit a few of them with snowballs and they all began to growl at me. Also, all but one of them will not stand up, but the one that will stand up is still growling at me.

I had a group of about a dozen tamed wolves sitting down together in a room inside my house. I had left them there for a long time without telling them to stand up, so they were undisturbed other than my iron golem occasionally bumping into them. One day, I hit two or three of them with snowballs that I had thrown. They then all began to growl at me. Thinking that they had somehow taken damage from the snowballs, I threw 2 splash potions of healing at them and fed them all rotten flesh. This did not help. I tried feeding them bones as well, and as I tried to do this, I realized that all but one of them were stuck sitting down and would not stand up when I told them to. But, the one that will stand up is still growling at me uncontrollably. I am not sure whether or not the growling and the wolves being stuck sitting down are related or not, but I noticed them both at the same time, so they may or may not be related. They had been left there when I was playing version 1.2.2, which I then updated to 1.4.2, and all of the versions after that up to the current version, 1.4.7, and I was playing 1.4.7 when I noticed the bug(s).