I worried about it too, when he was little, but~ It is ALL HE WANTS TO DO! So we do it.
He hasn't turned into a crazed pit bull because of it so we're ok.
Nothing against pit bulls...
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Rhonda, Bailey, Josie and my angel Bella Rue'
"Until one has loved an animal, a part of one's soul remains unawakened."
~Anatole France~