Sorry there is a problem with vercion 0.15.7 as having many animals together for example in a corral to re-enter the game causes almost all animals leaving or elsewhere aparescan
MCPE-16887
problems with animals 0.15.7
Resolved
Duplicate
0
Thank you for your report! This issue was, however, submitted at an earlier time as MCPE-14769. You may add any information you find relevant in the comment section there.