Can't make my pets stand up.

I recently made a world and it was doing great! But then suddenly when I joined today I was about to travel with my pets to a nearby village to see what loot I can find there and to see if I can stay there for the in-game night. But then I tried to make them stand and they just wouldn't I switched the controls then tried but it still didn't work. Infact I killed one of my pets because of trying to make them stand! I was really sad since I killed one of my first pets in my world. So I went here to report this bug so that it wouldn't happen again to not only me but others aswell. (I've also restarted my wifi and restarted the world) I hope you can fix this bug,