Well-built, not well built. If an adjective describes something with an adjective, there is often a dash.
Topaz-eyed cat.
Two-tailed cat.
Clean-haired cat.
Well-built Osho-cat (Osho is the name of the cat, the dash is for cuteness. Can be or not be used).
Heavy-bellied cat was pregnant.
Bullied cat. No dash.