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40 Top Medium-Sized Dogs

Good Housekeeping Logo By Caroline Picard of Good Housekeeping | Slide 1 of 40: 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.

Collie

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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