Muzzle length / brachycephaly (BMP3-related) - Dog

What does this test examine?

This genetic test analyses the BMP3 variant c.1344C>A in dogs. The trait is known as muzzle length, brachycephaly, short muzzle, brachycephalic skull shape and craniofacial conformation. BMP3 is involved in facial and skull bone development. The tested variant is one genetic factor that can contribute to a shorter muzzle and the typical appearance of short-muzzled dogs.

What does brachycephaly mean?

Brachycephaly means that the muzzle and parts of the facial skull are relatively short. This may be part of a breed type, but extreme short muzzle conformation can be relevant for breathing, heat and exercise tolerance, dental alignment, eye comfort and daily care. The BMP3 variant does not determine skull shape on its own: muzzle length is multifactorial and influenced by several genes together.

• C/C: the tested BMP3 variant was not detected.
• C/A: one copy is present and can contribute to shorter muzzle length.
• A/A: two copies are present and indicate a stronger genetic tendency toward shorter muzzle length.

Practical value of this test

For breeders, this test helps include skull and muzzle shape more deliberately in selection. The result makes genetic tendency for shorter muzzle length visible, supports better mating choices and helps manage extreme conformation more intentionally. For owners, it provides extra insight into the genetic background of appearance and into points of attention around exercise, heat, breathing, teeth and eyes.

• Supports selection for balanced muzzle length and breed type.
• Helps explain why short muzzle conformation may be present in a line or mating.
• Provides useful breeding information without pretending that one variant explains everything.
• Works best when interpreted together with conformation, breed background and related traits.

Inheritance and interpretation

Muzzle length and brachycephaly are multifactorial. The BMP3 c.1344C>A variant is an important genetic factor, but other loci such as SMOC2 and additional skull-shape genes can also influence the final appearance. The result should therefore be read as genetic tendency for muzzle length, not as a complete prediction of all health or conformation features.