My dog often does little tricks for me. When it wants to perhaps. But if you tried to make it do unnatural or difficult tricks twice nightly timed to the split second in front of an audience, it wouldn't work. Because your pet knows you won't hurt it and isn't afraid of you. The performing animal acts through fear of man's domination instilled during the rigorous breaking-in and training period.
Animals can' t choose.
Utterly at man's mercy they are forced to be there and forced to perform. Man degrades himself too when he exploits and dominates animals in this way. Children would miss seeing them. They see animals to much better advantage in TV programmes and films when they are behaving naturally in their own surroundings. Children learn by example.