Not my field, but I read somewhere that with grass and grass-like plants, sheep tend to bite it through, whereas goats tend to clamp their teeth onto it and pull it up by the roots. So goat pruning tends to last longer.

I dunno, though. Not my area of expertise….

Don Firth

P. S. Sheep probably make better pets. But there is a sort of whimsically humorous side to goats.