Other critters do NOT count--goats need other goats--not a pig or something else as a "companion" I will not sell a goat to someone to be alone, nor will I sell one to someone who does not even know minimal care information.
Goats are very intelligent, very social animals who do not deserve to be just another critter so you can say you have a goat. And whoever you are getting the goat from is certainly not a breeder, just an owner, or you would have been asked questions about your goat knowledge, and if you had a GOAT companion for your new goat. Obviously that person is only looking for a sale, and could care less about the animal.
If you really love animals, you will learn QUICKLY how to properly care for your goat, and you will not want your goat to be miserable and alone.
Goats often eat toxic plants they are ignorant of, like hemlock or yew or rhododendron, etc.
Do you know what plants you have on your property, and if they are toxic?