Is it possible to have pets that don't impinge on other life forms? Even placid dogs still need to eat (I'm not sure how popular vegan dog food is, although it

Is it possible to have pets that don't impinge on other life forms? Even placid dogs still need to eat (I'm not sure how popular vegan dog food is, although it does exist). Some (not all) plants are not a net-negative on other life forms, and some chemosynthetic organisms use chemical reactions as their energy source. In the extreme, perhaps those pets wouldn't have any negative impacts on any other life forms. </silly thought experiment>