At the beach, suddenly a dog ran up to a pile of sand, started growling and barking, and then began digging in the sand: what it pulled out shocked everyone 
It was an ordinary hot day. There were many people on the beach. Children were building sandcastles, making figures, burying each other in the sand, and running along the shore. Some were relaxing with their families under a beach umbrella, others with friends, swimming, sunbathing, playing ball. It seemed like a calm day, just another warm and carefree summer moment.
Among the bathers was a man in his forties. Tall, wearing a panama hat, he was walking slowly along the shore with his dog — a reddish short-haired dog with a black collar. He held the leash in his hand, sometimes talking to his pet, which wagged its tail happily, sniffing the air and leaving tracks in the sand.
Everything changed in a second.
Suddenly the dog sensed something, quickly turned its head toward a large pile of sand nearby. It seemed the children had just finished building it and had gone swimming. The dog ran toward the pile. The man didn’t manage to stop it in time — the leash slipped from his hands and the dog dashed toward the pile.
At first, it looked like a game. The dog started growling and barking, circling the sand pile, then began digging intensely. Sand flew everywhere, the dog dug deeper, ignoring the owner’s words and people’s gazes.
— Hey! Calm down! — the man shouted and ran to grab the dog. But it barked louder and kept digging.