The dogs' behavior is intriguing. Which of the 75 theories proposed so far can incorporate this fear and also the "going crazy" at the tent? So far, I can think of at least one -- wolverine.
Potyazhenko
".. there were search and rescue dogs, or service and search dogs, they are great.
"I: And how many were there?
VV: There were two of them. It was a terrible sight, and kind of funny, but in fact, when we saw that they didn’t want to get out of the helicopter and snarled, fear snuck up on us.
"I: How do you explain this?
VV: Well, apparently, there was some kind of smell, there might be some kind of small vibration on the ground that a person does not feel, but they did. They got out of the helicopter - the cynologist pulled them out, they pressed right against him, their tails between their legs, their ears lowered and they won't let him go anywhere. He barely took them to the tent, and there the dogs went crazy.