What does it mean when a dog puts his paw on its snout?

A dog may nudge another animal with it's 'snout' because it may want it's attention for any ceritain reason. I'm not entirely sure, in some cases they nip, or lick. My dog nudges my cat purely because it wants the cat to knowledge it's existance. The cat completely ignores him, which then causes him to bark.

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It is part of their conversation. My German Shorthair, Allie, nudges me when she wants to say something. She has certain sounds and whines for certain things. Whether she says her water dish is empty (she takes me to the kitchen sink and whines) or it is 6pm and time for her supper (takes me to her tupperware container with her food, across the kitchen from her dish) or goes to the turntable cupboard, waits for you to open it, and SHE takes out her quart jar with snacks.

She converses. Does she want to go out? Opens the door to let herself back in. Also, whines at 9pm, time to go to bed. She loves being at my computer area, lays at my feet.