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Jack Russell Terriers can barely contain their energy in their small bodies. They’re feisty pups with a penchant for digging, barking, and hunting, but they’ll promise to behave for some belly rubs. Jack Russells may not be calm or easy to care for, but they’re sure to keep their families safe and on their toes. Full-grown, they typically weigh 13-17 pounds and stand 13-14 inches tall.

Jack Russell Terriers are generally okay with older children who know how to handle dogs. Because of their high energy, these dogs are happiest in homes with large yards where they can run and exercise. Jack Russells prefer to be inside most of the time, where they can be around people and alert the family to approaching strangers. They're moderate barkers — they'll alert you when something's up but aren't excessive.

Jack Russell Terriers have an unmatched energy and need plenty of exercise to burn it off. If your pup gets obnoxious or destructive in your home, chances are they aren’t getting enough activity. These pups love to run around and play with you and other dogs. Overall, their exercise needs are very high.

Jack Russell Terriers come in three varieties, each with different grooming and care requirements. Smooth-haired Jack Russells have a full coat of smooth, thick fur that covers their entire bodies. On the other hand, rough-haired Jack Russells have a typical double-layered terrier coat. Grooming-wise, this breed is low-maintenance.

Jack Russell Terriers are best suited for apartments and smaller homes. Because of their high energy, these dogs are happiest in homes with large yards where they can run and exercise. Jack Russells prefer to be inside most of the time, where they can be around people and alert the family to approaching strangers. They are fairly easy to train.

These pint sized pooches aren’t short on smarts! While they make lovable and devoted lapdogs, Chihuahuas possess a ninja-like agility, graceful demeanor, and bravery that sometimes gets them into trouble. Full-grown, they typically weigh 2-6 pounds and stand 5-8 inches tall.

Chihuahuas are generally not the best fit for families with young kids. Chihuahuas can usually live with other dogs and cats without problem. Socializing the Chihuahua as a puppy is essential to prevent overt aggressiveness and avoiding World War III with other pets in your house. They're very vocal and bark quite a lot.

Chihuahuas can usually get all the exercise they need by running around indoors. If the dog becomes a little chubby, put on the Tai Bo DVD and get down! Actually, these dogs should be allowed to walk everywhere until the desired weight is reached. Overall, their exercise needs are low.

Chihuahuas can have a long or short coat and come in a wide variety of colors, including sand, chocolate, silver, chestnut, and even blue. A plethora of patterns including sable and masks are also a possibility. It’s this very variety of possibilities makes classification so difficult. Grooming-wise, this breed is low-maintenance.

Chihuahuas are best suited for apartments and smaller homes. Socializing the Chihuahua as a puppy is essential to prevent overt aggressiveness and avoiding World War III with other pets in your house. They are moderately trainable with consistent effort.