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  • Who's Healthier: Purebreds or Mixed Breeds?

Who's Healthier: Purebreds or Mixed Breeds?

For years, pet owners have disagreed about whether purebred or mixed breed dogs are healthier. Until recently, there was no scientific data to back up their opinions, but UC Davis researchers recently helped answer the question with a landmark health study.

The Arguments

Pet owners who thought that mixed breed dogs were healthier argued that inbreeding in purebred dogs increased the likelihood of genetic disorders. Other owners felt that purebred dogs were healthier because many start their lives in professional breeding facilities and are not exposed to infectious diseases that may circulate through animal shelters.

Hip Dysplasia Is a Purebred Problem - Or Is It?

Hip dysplasia is often used as the prime example of an inherited health problem that primarily affects purebred dogs. The condition, which occurs due to a malformation of the ball and socket joint in the hip, causes pain and weakness in the hind legs and can increase the risk of osteoarthritis. Contrary to popular belief, the UC Davis revealed that hip dysplasia was just as likely to occur in mixed breed dogs as it was in purebreds.

Other Disorders with Similar Rates in Both Purebreds and Mixed Breeds

Researchers reviewed the records of 90,000 dogs who were patients of the UC Davis veterinary teaching hospital from 1995 to 2010. In addition to hip dysplasia, they noted that a number of other genetic disorders occur equally often in both groups. They include:

  • Heart Disorders. Mitral valve dysplasia, ventricular septal defect, hypertrophic cardiomyopathy and patent ductus arteriosus occurred at about the same rate in both purebred and mixed breed dogs.
  • Cancer. Cancers, including osteosarcoma, hemangiosarcoma, mast cell tumor and lymphoma, also occurred at about the same rate.
  • Orthopedic Disorders. Patellar luxation (dislocated kneecap) was seen in both purebred and mixed breed dogs.
  • Eye Disorders. Both groups also suffered similar rates of lens luxation, a condition that happens when the clear lens located behind the iris of the eye becomes dislocated.
  • Endocrine Disorders. Both hypoadrenocorticism (Addison's disease) and hyperadrenocorticism (Cushing's disease) occurred at about the same frequency in both groups of dogs.

Disorders More Common in Purebred Dogs

Some disorders were more common in purebreds, although the chance that your dog will develop these disorders depends on its breed. For example, large dogs like Saint Bernards and Great Danes are most likely to suffer from bloat. The disorders include:

  • Cataracts
  • Bloat
  • Elbow Dysplasia
  • Allergic Dermatitis
  • Aortic Stenosis
  • Dilated Cardiomyopathy
  • Hypothyroidism
  • Epilepsy
  • Portosystemic Shunt
  • Intervertebral Disc Disease

What About Mixed Breed Dogs?

Cranial cruciate ligament rupture was the only disorder more likely to occur in mixed breed dogs. The ligament helps keep the knee joints in the hind legs stable.

What Is the Bottom Line?

Although purebred dogs do have a higher incidence of some inherited disorders, they are no more likely to develop many serious health conditions, such as cancer, heart disorders and endocrine disorders, than mixed breed dogs. It's crucial to ask questions about health when you consider adding another pet to your family, but it's equally important to consider the animal's temperament, personality, ability to get along with your other pets and the dog's fit with your family.

Regular veterinary care is the key to keeping your purebred or mixed breed dog healthy. If it's been a while since your dog has seen a veterinarian or if your pet is experiencing a health problem, call us today to schedule an appointment.

Sources:

Healthy Pets: The Surprising Truth About Mixed Breed Dogs, 7/5/13

http://healthypets.mercola.com/sites/healthypets/archive/2013/07/05/pet-genetic-disorders.aspx

Mercola: Prevalence of Inherited Disorders Among Mixed-Breed and Purebred Dogs, 6/1/13

http://mercola.fileburst.com/PDF/HealthyPets/InheritedDisordersOfDogs.pdf

Dogs Naturally: Are Mixed Breed Dogs Healthier Than Purebreds?

http://www.dogsnaturallymagazine.com/genetic-dog-diseases-in-purebreds-and-mixed-breeds/

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