I have read that if the dog looks more like one of the breeds, its characteristics are like that breed. In my case, it's true. My dog is a Shih-tzu x Bichon and she looks like a Bichon. She has all the Bichon characteristics - lively, happy, friendly, likes to bark etc. But my dog isn't a great example as both breeds are quite similar in terms of temperament. But if it's more lab, then maybe the scent hound won't be as much of a problem as you think.
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