Sunan Abi Dawud 4465
سنن أبي داود#4465HasanAsim reported from Abu Razin on the authority of Ibn 'Abbas saying:There is no prescribed punishment for one who has sexual intercourse with an animal. Abu Dawud said: 'Ata is also so. Al Hakam said: I think he should be flogged, but the number should not reach the one of the prescribed punishment. Al-Hasan said: He is like a fornicator. Abu Dawud said: THe tradition of 'Asim proves the tradition of 'Amr b. Abi 'Amr as weak
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Muhyi Al-Din Abdul HamidHasan
Zubair Ali ZaiIsnaad Hasan
In-book reference: 40:115