In such cases, it's best to assume it's a special zero dimensional point goat, which only chews grass.
Slightly more seriously, you take the limit of a alpha-sized goat tied with an alpha-sized rope as alpha goes to zero from above.
Q: How do you know he's in the fence at all? A: From definition.
Q: How does he chew the grass? A: Using axioms.
Q: Where does the grass go? A: We need more grants^Wresearch to answer that.