Before i moved house the hens were a good bit away so my terriers could not mix with them, but now i moved house the terriers and hens mix mostly without any problems but i am in the middle of building a fence so the terriers can have the front half of the garden and the hens can have the back.I can never trust my dogs 100% they have snacked on the odd one, i got 2 new hens a few months back and one will attack the terriers but i am wary that the terriers will get pissed off and rip its head off