@ Raven, you wouldn't believe animals were healing if you met my insane cat lol jk. no matter how crazy Gir is, he can tell when someone needs help.
everything has magic, it just comes down to if they can cast or not really. people use to believe nocturnal animals and black animals [dogs, cats, rats, bats, ravens, crows] were working with witches to do harm, so they were shunned from society. i do believe that yes, plants and animals have magic abilities, but like with the animals helping heal, i do feel if an animal was abused in such a way, they could bring misfortune upon their owner [but maybe i've read Poe's Black Cat story too many times]
i doubt most can cast [why, not too sure] but i know there's magic in them. try sitting under a tree for a while, see if you can feel anything. there was this one lilac in my old houses back yard i use to sit under [also buried some pets under] i really liked that tree, because while it wasn't one of the better looking lilacs on the property, when it bloomed, it was purple flowers. i always felt there was something about that tree, don't know why. i use to trim branches off the trees [cuz we had a lot of them] that was the only one i talked with before trimming it. also made a few wands from the branches.