Reading this made me realize-I don't think I've ever heard anyone in the DR use the more neutral and medically sounding word 'hiperactivo' to describe a person or animal. The more common expressions, unfortunately, seem to be molestoso (annoying), inquieto (restless?) or muchacho del diablo (child of the devil), fu?on (as in le gusta fu?ir demasiado) or jod?n (as in le gusta joder la paciencia).