Most llamas enjoy being with other livestock - goats, sheep, horses, cattle. Some get along with some varieties and not others - we had one foster llama that hated sheep - but loves goats.
You always want to introduce them through a fence, and then supervise them in a shared space, to make sure they are "safe".
They don't "bond" with the other animals, as much as they are territorial, so you don't need to worry about them ceasing to protect if you have more than one llama. We always keep two in any pasture we are protecting...so one doesn't get distracted and ambushed by a pack.
The biggest thing to watch are your dogs...llamas can and will kill a dog/coyote/wolf. That is their main function in a guardian position. Usually once they understand that the dog is part of the family, they will leave it alone, but always make sure the introduction is clear, that the dogs don't harass or chase the llama, and until you are sure they are okay - don't let the dog be unsupervised around the llama. We had a new llama attack one of our dogs - and it was another llama that came to his rescue, strangely enough!
Yes, llamas are one of the gentlest, most respectful animals you will ever find. It is true that they are easy keepers and don't eat much (about 6 pounds a day of quality hay). If you love to learn, you will love llamas - they love to learn too -and you can have all kinds of fun with them! They love a challenge, and will do obstacle courses, tricks...pull carts!
You might want to keep barbs off the fences - they will get caught in the wool
Feel free to take a virtual visit of our farm website...where we keep our llamas with lots of other animals!