Talk to your dogs like they're people. Mostly. Remember that they have an emotional and mental age of a two-year-old. So lots of baby talk is ok on occasion. It depends on what you want from your dogs. If you want obedience use your command voice. If you're playing use a more playful voice. Just talking to your dogs is a big treat for them. They like the attention. But their attention spans are short. So just enjoy your dogs and do what comes naturally. They'll respond.