Hazrat Moulana Ashraf Ali Thanwi (rahmatullahi ‘alaih) once mentioned the following:
Just as consuming haraam is impermissible for oneself, similarly it is also impermissible for one to feed one’s family with haraam food. In fact, feeding animals haraam food is also impermissible.
One should ensure that one does not feed animals with haraam. One should dispose of the haraam food by leaving it in some place. Thereafter, if an animal comes and eats it, then there is no problem (and one will not be sinful as one did not feed the animal the haraam food).
Those who feed their children with haraam, then such haraam food creates rebellion and evil qualities in the children.
(Malfoozaat Hakeemul Ummat 23/91)