wait... do dogs attack llamas ? it could be self explainatory but how did they get up by themselves

Dayum i just went on a mining trip and this went terrible, first it was a black moon, and then smh 2 of my dogs and one parrot standed up by themselves to accompany me in this fricking dangerous journey. So i go back to the surface and... wtf, 5 out of my 6 llamas got taken out by god knows what. Since when did hostile mobs attack llamas im crine they got decimated