The goat is an animal found in the Witcher universe. In The Witcher 3: Wild Hunt, they can be found in the Kaer Morhen valley, Novigrad, the Skellige Isles and Velen.
In The Witcher 3: Wild Hunt they appear in both wild and domesticated version, fenced or wandering around, e.g. in Yantra. Their behaviour is different from the cows' and pigs' one as they escape from Geralt even if not attacked.
Loot is a Goat Milk, Raw Meat and Goat Hide, not depending on being wild or domesticated.