"Loose" means tied up so he wouldn't eat the chickens or the pet deer. We have underground fence but a big angry determined dog with thick hair can run right through one. The pit bull has ran through it several times without caring if it got shocked or not, if there was something on the other side of the fence it wanted. We had been keeping him tied up because he killed 24 chickens in 10 minutes which has to be some kind of record. In his short life he killed 30 chickens, mauled a goat, chewed up a motorcycle helmet,numerous dog food bowls, and a pair of glasses, bit a pig, attacked a stray hound dog and completely destroyed a dog pen and dog house we tried to keep him in. I should have named him Destructo-dog. In his better moments he was basically a good dog, despite his wolf heritage.