Dog vs Siberian bear

At the winter base of oil producers in Siberia came hungry bear and began to rummage in the pit with food waste. At first the men were frightened, but soon got used to it. And even threw him food. Only dog Rex remained vigilant and kept the bear close to the people. Daily it was possible to observe the dialogue between the dog and the bear. Aggressive negotiations sometimes moved in small skirmishes, but the bear endured attack dogs to get food. The bear came to visit every day for a month and then disappeared. Apparently went fishing in a small river. Just started spawning in Trout. Early spring in Siberia when bears Wake up from hibernation very difficult for them to find food, especially in April. The animals are still sleeping, and the plants are still covered with leaves. So we have Siberian bears to come to the people in search of food.