Unorthodox Beast Control

Good news: I have traveled through time and there is a system.
Bad news: This system is crooked!
Xu Ran fell into deep thought as he looked at the pet beasts that trembled and made strange noises as soon as they were bathed, went blind and howled all night long as soon as they were fed, and behaved more and more abnormally after training.
How should he explain to the masters of these beasts that he is really a serious person? !