My goats eat stuff said to be poisonous too like lilac. If they're eating them and they are fine I would guess it's okay.
Ours ate a half box of rat poison once and somehow it didnt kill them.
They have eaten the strangest stuff. Love cigarette butts and paper the most. Just had the water company out the other day checking meter for leaks. Our billy eat half his paper he had on a clip board while it was in his hand. No big deal except it was his list of stops for the day.
I never realized just how hard they were on plants and trees though. First they will eat every flower, shrub or any plant life you dont want them to. Then they will eat every leaf in reach even evergreens. After the leaves run out theyll eat the bark off anything that has. Have had every small tree die and a couple huge ones.
Double then triple check your fencing. Get a bucket of water. Throw it against fence. If any water makes it through then so will a goat.
We have nigerians. They can all hop a 42" fence and one can easily jump a 4' fence. Go with no bigger than 4" goat fence. The 6" field fence will allow them to get their heads stuck if they have horns. Ive had to cut fence to get them out several times. Sometimes several times in a row. Get them loose and theyll walk over two feet and stick their head right back through. Then you have to patch the hole you made. Mine have walked through any 6" x 12" hole in fence. Theh will also pull fence up and crawl under it.
They love to climb especially when young. Their favorite thing will be your vehicle if they get the chance.
I like the goats but usually when anyone asked advice about getting goats my advice is to get sheep instead.