I practice Buddhism & Jainism! For anyone who might be interested in knowing, bestiality is not defined as a type of sexual misconduct in either religion. There is express mention of monks or nuns not having sex with gods, beasts or men which proves that bestiality was known of in ancient India, but they cannot have any type of sex at all. As for the common lay follower such as myself most types of sex are defined as permissible, it's more that there is an emphasis of not being excessive about it.
There is one later scripture belonging to the later Sanskrit Buddhist tradition which points out bestiality as well as an insanely long list of other things like pedophilia and even non-vaginal sex as leading to hell, but I don't pay much mind to it or give it much credibility since it's overly conservative and I've never heard any teachers referencing it or taking it seriously.