Dr. van Haeringen Laboratorium B.V.

H312 Craniomandibular Osteopathy (CMO)


Craniomandibular osteopathy (CMO) is found in Cairn terriers, Scottish terriers and West Highland White terriers and rarely in other breeds of dogs. The disease affects form and function of bones of the skull (tympanic bullae) and jaw (mandible). It is usually recognized at an age from 4 to 7 months when problems with chewing and eating occur. The jaw is bilaterally thickened and several bones become so large and tender that the mouth cannot be fully opened. A causal CMO mutation was identified which showed an autosomal dominant inheritance with incomplete penetrance. In the initial study, more than 57% of homozygous mutant dogs were affected with CMO. Homozygous mutant dogs therefore are classified as having a high risk to develop CMO. Dogs heterozygous for the mutation might also develop clinical signs; they are classified at low risk.

Test specific information



Symptoms will develop at a young age. Within a few hours to a maximum of several weeks after birth, the characteristics that go with these genetic effects will become visible.

Turnaround time

The Turnaround Time (TAT) depends on various factors, such as the shipment time of your sample to the test location, the test method(s) and whether the tests are performed completely or partially by a Partner Lab or Patent owner.

The TAT of tests performed at our facilities is normally 10 working days after receipt of the sample at the testing laboratory (VHL, VHP or Certagen). For tests performed by a Partner Laboratory (so-called "partner lab test") or patent owner, the TAT is at least 20 working days after receipt of your sample. Because the shipment time to our Partner Labs or patent owner may vary due to factors we cannot influence, the mentioned 20 working days are therefore an estimate.

Sometimes it is necessary to re-run your sample. We call this a retest. In that case, the TAT will of course be extended.

Location of disease or trait

This disease is present in the entire body, but causes main effects in the internal organs such as stomach, intestinal tract, liver and / or kidneys. In a number of cases, the disease affects one major internal organ.

Breed dependence

This DNA test is available for the following breeds: American Staffordshire Terrier (AmStaff), Cairn Terrier, Scottish Terrier, Skye Terrier, Westhighland White Terrier. Additional information is available in the Frequently Asked Questions (FAQ).

Sample type

For this DNA test we accept the following materials: Blood EDTA, Blood Heparin, Semen, Swab, Tissue. Please contact Dr. Van Haeringen Laboratorium if you wish to submit other material as listed.


An animal can be free and has in that situation two healthy alleles. When used in breeding this animal will not become ill due to the disease. It cannot spread the disease in the population.

An animal can be carrier and has in that situation one healthy and one disease allele. When used in breeding 50 percent of the offspring will receive the disease allele. Carriers will also become ill.

An animal can be affected and has in that situation two disease alleles. When used in breeding all offspring will also receive the disease allele. Affected will also become ill.


This genetic factor is inherited in an autosomal, dominant, mode. This means, that the individual can be free of the mutation (homozygote normal), affected (homozygous affected) or carrier (heterozygous affected). Both carriers and affected individuals will show symptoms of the mutation.

Severity of Disease


Code H312

Craniomandibular Osteopathy (CMO)

€ 57,48 (Incl. 21% VAT)
€ 47,50 (Excl. VAT)