Does our dog need more training?

My husbands family dog (now ours) has always bit him and his family since they got him, he is now 8 and just bit my husband for laying down next to him- and the bite broke skin and is pretty deep! My husband says it’s okay, and thinks his behavior is nothing to be worried about- but I am shocked and worried about it. I think his dog needs more training but my husband doesn’t agree. What do you think?

Does our dog need more training?
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