Eruption times differ between breeds so it is difficult to age dogs by their teeth. '''Brachiocephalic''' dogs do not possess all of the cheek teeth. They have '''fused [[Enamel Organ#Root|roots]]''' and '''carnasial teeth''' (upper P4 and lower M1). | Eruption times differ between breeds so it is difficult to age dogs by their teeth. '''Brachiocephalic''' dogs do not possess all of the cheek teeth. They have '''fused [[Enamel Organ#Root|roots]]''' and '''carnasial teeth''' (upper P4 and lower M1). |