Dogs like having and being with a pack.
While Duffy might get jealous at first, soon he will accept a new friend. The trick is for Duffy's mom to be the pack leader. In order to lessen any competition, Duffy's mom must dole out affection, treats, and attention to both equally, not showing favoritism, then the two dogs will not compete and will become companions.
When they are left alone in the house, the two dogs will keep each other company and wait for their "leader of the pack" to return.
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 K9-Lovers
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