It’s a good idea to study an alpaca’s behavior before purchasing. You should find out ahead of time if an alpaca is territorial or if he will do well with the other farm animals you may already own. In general, an alpaca will act aggressive and territorial if he feels he is being threatened or if his space is being threatened. It’s better to introduce the alpaca into a herd then introduce a herd to the alpaca as the alpaca will be very possessive and not want to share. In other areas, alpacas are considered to be pretty docile. In fact, they are not as territorial as dogs or donkeys. Once the alpaca accepts is space and those in it then he can be very protective. In a herd of alpacas you will have one alpha male along with a female and their young. Your local trustworthy vets Mt. Airy MD can tell you that the alpha alpaca is very protective of his herd.