Neck Extender - Hi-HogHi Hogs low stress neck extender offers superior access for performing neck injections. Hi Hogs neck extender is linked directly to Hi Hogs self catch head gate, which allows the neck extender to be activated by the animals shoulders while the animal contacts the self catch head gate. This minimizes the risk of stressing or injuring your livestock while allowing the animal to catch itself without a handler at the head gate.