The main composition of horns is keratin, the same material that makes up hair and fingernails. The core of a horn is, however, made of bone.
Used for defense, horns are extremely advantageous in the wild. Horns will grow for an animal’s entire life, much like a turtle’s, which is also permanent and comprised of bone and keratin. But horns cannot grow back, which means a broken horn can make an animal extra vulnerable in the wild.
A Guide to Goat Horn Sizing
Small horns – 50g to 100g (only suitable for small dogs)
Medium horns – From 100g to 150g
Large horns – From 150g to 200g
XL horns – From 200g to 250g
XXL horns – From 250g to 300g