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40 Top Medium-Sized Dogs

Good Housekeeping Logo By Caroline Picard of Good Housekeeping | Slide 1 of 40: <p>Collies exhibit the qualities of loyalty, intelligence, and gentleness, and live up to their "hero" reputation from Lassie. A desire to please is hard-wired in the collie's genetic makeup. They're easy to train but tend to be very noisy. </p>


Both Timmy and Lassie can attest to the devoted nature of Collies. These active yet affectionate herders can follow commands quickly and accurately, but be forewarned: They do tend to bark quite a bit.

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