A woman should not have an animal be intimate with her whether in a natural or unnatural intimacy
“A woman shall not bring an animal upon her” Vayikra 18:23
There is no written distinction about the animal being old or young, this law is the same for a wild animal or bird.
The person and the animal are punishable with death by stoning even for beginning sexual contact.
If there was no prior warning the person’s penalty is spiritual severance and the animal is stoned to death.
If done unwittingly the person must bring a sin offering and the animal is free of penalty.
This applies in all places at all times.