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I misunderstand your last sentence: what good is an antibiotic not useful on animals, given that we are animals?

Non human animals. Farmers feed massive amounts of antibiotics to their livestock. This used to increase their weight, but it’s no longer clear that this works.

For reference, ~80% of antibiotics in the US are used on livestock, not to treat infections, but to prevent them and because pumping them full of antibiotics successfully increases animals' weights[1], as you said.

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4638249/

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