Jack Russell Terrier is smart and active, but not the right dog for everyone. So, if you have a demanding job to challenge his body and mind, you may have found your match. Just know that if he's not kept busy, that intelligence and athleticism can be used for more nefarious purposes — such as digging through the family sofa.
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Shetland Sheepdog, the Sheltie is known for being funny, loyal and undeniably cute. His athleticism and desire to show off often make him a natural at trick training, but be mindful of the fact that this breed is also known for barking.