Dear Daisy Dog: It looks like my dog, Henry, broke the tip off one of his fangs. Do I need to do anything about this?

Daisy responds: One in four of us dogs breaks a tooth during his or her lifetime. Almost half these fractures expose the sensitive pulp canal.

If Henry broke only the tip of his fang, or canine tooth, he may be fine. But if the fracture exposed the pulp canal, he's in pain and needs treatment.

The only way to know for sure is to have your veterinarian anesthetize Henry, probe the tooth and take dental radiographs (X-rays).

If the fracture exposed the pulp canal, bacteria can enter and infect the sensitive nerve and blood vessels, causing pain and destroying the bone surrounding the tip of the tooth's root. Extraction or a root canal will effectively treat such a tooth.

The dental radiographs also will show whether the crowns or roots of any other teeth are damaged, so all problems can be treated at one time.

Since we dogs rarely let our people know when our teeth hurt, you should make an appointment with Henry's veterinarian immediately.

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Dear Christopher Cat: We are thinking about buying a Maine coon cat. One breeder has her cats tested for heart disease; not surprisingly, her cats are more expensive. Another breeder says Maine coon cats are healthy, so testing is unnecessary. What's the truth?

Christopher responds: While Maine coon cats are generally healthy, some inherit genetic diseases that can shorten life, cause pain or decrease mobility. Responsible breeders have their cats tested and share the results.

The three most common inherited diseases in Maine coon cats are a type of heart disease called hypertrophic cardiomyopathy, or HCM; hip dysplasia; and spinal muscular atrophy, or SMA.

HCM, a common cause of heart disease in purebred and mixed-breed cats, is characterized by heart walls so thick they don't contract normally. The disease occurs in cats without a family history of HCM or can be inherited.

One in three Maine coon cats inherits a gene mutation that causes the disease. Heart failure or sudden death occurs at 6 months to 7 years of age. Genetic testing and cardiac ultrasound can help identify affected cats.

Hip dysplasia, abnormal formation of the hip joint, occurs in 23 percent of Maine coon cats. The condition leads to arthritis with hind leg weakness and stiffness that can make it difficult to posture normally in the litter box and jump onto furniture.

SMA occurs when nerve cells in the lower spinal cord don't develop normally. At three to four months of age, affected cats lose hind leg muscle tone and have trouble walking. Genetic testing is available.

Spend a little extra to work with a breeder who screens all breeding cats for these diseases. If your new family member is healthy, you'll save yourself considerable heartache and the expense of treatment.

Ask the Vet's Pets appears Friday in the print edition of the Reading Eagle. The animal authors of the column live with Lee Pickett, V.M.D., who practices companion animal medicine. Contact them at www.askthevetspets.com.