How dangerous is the pellet?
As with any gun, they should always be treated as if they were loaded at all times. These pellet guns will kill a small animal. They are powerful enough to shoot rats in the barn and they are very effective, so pets need to be protected. To a human the biggest risk is to the eyes and eye protection should always be worn by both the shooter and any observers. The pellet will go through a shirt and at a minimum leave a very nasty welt.