Pigs
"What wild pigs lack in grace and beauty they make up for in strength, adaptability and intelligence." They live in forests, woodlands and grasslands and tend to group in small bands. Their tusks are adapted canine teeth. Wild boars began to be domesticated around 9,000 years ago. There are sixteen species and the are omnivores and opportunistic feeders.
Sheep
Baaa....Sheep are most likely descended from the wild mouflon of Europe and Asia. One of the earliest animals to be domesticated for agricultural purposes, sheep are raised for fleece, meat (lamb or mutton) and milk. There are over 200 breeds of domestic sheep, and while they may have a similar appearance to goats, they are separate species and any hybrid offspring will be infertile. Sheep are herbivores, eating mostly grasses (as opposed to taller trees and shrubs.) These guys are naturally flock/herd animals and I haven't found a place in game where there are lone sheep wandering around. (Well, except for black lambs in Elwynn Forest.)