I've always used tethering and only once had a problem, that was a dog I had to chase off with the hose, he came at ME when I was barehanded so I snatched up the hose and turned it on full bore!
The advantages I found with tethering are you can put the goats where you want them AND where you can see them. I got a lot of brush cleared around the house that way.
I tether the donkey and he's no worry, and it keeps my little bits of lawn trimmed down

Take Care
Lois