The only thing that works for Timber and worked for Leather was the prong collar. Timber does okay with her harness (I think it's like the Lupi one -- it tightens around her body when she pulls), but it had no where near the affect of the prong collar. Choke chains and nylon chokes did nothing, and the Halti was HORRIBLE on both of them. Both Timber and Leather could get a halti off so easily. They just pull backwards and the strap slips over the head and the Halti will slip right off.