Fencing for LGD dogs?

In another post, Jan D.'s response to a question included this quote:

I have heard that from many people that Maremmas tend to wander at bit less because they bond closely to stock but fencing is a must for any LGD in my opinion.

Can anyone expand on this? Hopefully Jan will see this and chime in!

Currently our property is not fenced at all (20 forested acres in the very rural PNW). We do have chickens, and use a portable electric fence for their protection. When we add larger animals, I was considering simply using a portable fencing system for cell grazing.

If we need to fence the entire property for dog, that will change things quite a bit!

Thanks, all!

I see you addressed fencing in another post! I will post my questions there:

https://permies.com/t/41860/predators/LGD-Fencing

Thanks!

(Mods, feel free to remove this)