Just got a message that Markus (Mark Sloan) are missing 4 teeth.
We have experienced several heelers with missing teeth. So far, we think it's a ressesive thing, and while gathering information, Dick Koster have so far found 66 dogs with missing teeth and 246 "carriers" (i.e parent or offspring).
The FCI standar says this when it comes to teeth: "Jaws / Teeth: Scissor bite – jaws strong with a perfect, regular and complete scissor bite, i.e. upper teeth closely overlapping lower teeth and setsquare to the jaws. Under or overshot to be discouraged." So, it doesn't say that the breed shall have a complete dental.
Luckilly not many dogs will be affected by their lack of teeth, but still, one should keep it in mind when breeding. But the gene pole is not big enough to totally exclude dogs with missing teeth when breeding and missing teeth are not so serious compared to many other things.