and I for one with the number of terriers I have can attest to this.
Dogs that are tired or have spent their built or pent up energy are more inclined to accept training as they are more focused.
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No I am not a Miniature Doberman, I was around 200 years before Karl Frederich Louis Doberman created the Dobie, and as for my friends the Manx cats, yes they are better at playing fetch than I am, I am a Miniature Pinscher. http://blackhawkkennels.webs.com/