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• Miniature Bull Terrier

  Just as courageous, fiery, hard-headed and hilarious as his larger brother, the Miniature Bull Terrier combines all the pow of the Bull Terrier in a more compact and portable package. Even so, this is no lap dog. He would rather sit beside you or better yet, forge ahead towards the next great adventure. Of course, he wants you to come along, too.

• Miniature Pinscher

  With Napoleonic tendencies and terrier-like spirit, Miniature Pinschers are cunning, playful, and depending on their breeding, utterly fearless. Adventurous types, buckle your seatbelts!

• Miniature Schnauzer

  The jaunty beard, bushy eyebrows, and lively personality of the Miniature Schnauzer make it a fun and comical companion. They would rather get up and go than lie down and sleep, but the top priority of the Miniature Schnauzer is to be with the people he lives to please.

• Miscarriage in Dogs

  Miscarriage refers to the death of a fetus during pregnancy, with the most common cause being bacterial infection. Hormonal shifts or abnormalities may also cause miscarriages. In many cases, there are no visible signs of miscarriage. If miscarriage is suspected, ultrasound is used to assess the pregnancy and determine whether the fetuses are alive. Finding a cause for the miscarriage, especially if that cause is a treatable condition, may improve outcomes in future pregnancies.

• Multidrug Resistance Mutation (MDR1)

  Many herding breeds (most commonly Collies and Australian Shepherds) have a mutation at the MDR1 gene that makes them more sensitive to the negative effects of certain medications. These drugs include several antiparasitic agents (when given at high doses), the antidiarrheal agent loperamide (Imodium®), and several anticancer drugs. The effects of the mutation vary in severity, depending on whether the dog carries one or two copies of the mutation. There is a cheek swab or a commercially-available test that assesses blood samples for the presence of the MDR1 mutation.

• Neapolitan Mastiff

  True to his heritage and looks, the Neapolitan Mastiff can be a tough character. He's suspicious of strangers, aloof with acquaintances, but fiercely loyal to family. He's generally laid-back at home, and he doesn't bark a lot. Of course, when he does, you'll hear it.

• Newfoundland

  Newfoundlands are easygoing, face-washing people lovers and a great choice for the first-time dog owner who is not afraid of a little drool, a big dog, and a lot of hair.

• Norfolk Terrier

  I will fight him with both paws tied behind my back, I will! Yep, that is a Norfolk all right. Sometimes called a demon in the field, the Norfolk is a terrier through and through, with a feisty, scrappy spirit and plenty of energy for the next great adventure. She may be tiny, but buckle your seatbelts - you are in for a terrier of a good time.

• Norwegian Buhund

  Cheerful and highly active, Norwegian Buhunds form strong bonds with their families, and they love to snuggle and give kisses. They need plenty of exercise and stimulation, and love to play.

• Norwegian Elkhound

  The Norwegian Elkhound may look threatening, but he can be a sweetie-pie to his people. Threaten those people, however, and this medium-sized, ancient Nordic breed is fully capable of acting as intimidating as he looks.