Another story from a fellow hacker with a backyard goat - It actually starts in a very subtle way. Goats have different tastes and moods, and it's not like they eat everything right away unless the density of a goat per backyard m2 is too high. I started giving mine some free "roaming" time with the chickens every day before the sunset. It looked very innocent - first few days she ate just some weeds, nettle and some…
I suspect you may be falling to overconfidence there.
Also, single goat? That's tough, I've done it by running the goat with a pack of dogs and treating it as a dog, but witha lone goat, who doesn't feel they have herd, keeping them happy is difficult.