Tongue talk

I was looking at my dog Lily one morning, and she started just randomly flapping her tongue out of her mouth, similar to what a lizard does. So I flapped my tongue out at her and I think she actually responded to me with a series of different tongue movements. We held the tongue conversation strong for a while, though I had no idea what she was saying to me, nor what I could be saying to her. It was fun though, and eventually she came over to me to try to lick my mouth. Just now I started flapping my tongue at her, and she replied. Then she got up as to come over to me, but I came to her first. I think that dogs might actually communicate with their tongues. For instance, today I gave Lola a little morsel of food, and then she trotted into the dinning room. She then came back with Lily, but I had not heard them bark to each other, so it most likely meant that they had somehow silently communicated. And what better device to use then a tongue?