[Liesje]

AKC standard "Teeth --42 in number--20 upper and 22 lower--are strongly developed and meet in a scissors bite in which part of the inner surface of the upper incisors meet and engage part of the outer surface of the lower incisors. An overshot jaw or a level bite is undesirable. An undershot jaw is a disqualifying fault. Complete dentition is to be preferred. Any missing teeth other than first premolars is a serious fault."

Sounds like you can show them AKC, but it's a fault.

 

[Liesje]

Yeah that would make sense. Loosing a tooth in an accident or whatever is different than never having one. A lost tooth doesn't really affect the dog's genes.