Can we add Goats to Tartosa and Sheep to Moonwood Mills?

I see them as a version of the wild rabbits in Cottage Living, just that these are individuals. They even help with gardening by ie eating weeds. I don't think they have multiple life stages, but I'd be surprised if they live forever. I'm quite looking forward to them, they might work as a live stock (selling wool/milk) and as a single pet.