you go to the forest (For the wolves) and just explore. For another beast, like a tiger, You have to find the Elf girl at the Lake. You will get a cutscene of her and her partner/friend Tiger and eventually you will be able to mess around with him. In order to get pregnant by an animal you must find Annie in the mixed bath in the "Leisure" section of Tale and go to her store after some interaction with her at the baths. Then you buy I think it started with an c.. But you buy a certain potion that lets you get impregnated by beasts. Good luck <3