We have two Samoyedes, they weight around 20kg & 26kg respectively, so a potential combined missile weight of 46kg, that’s enough to give you a very badly snapped spinal chord in the event of a collision! I have attached a spring loaded galvanised 2 tonne shackle flush to the floor by the hab door, and an extra heavy duty y shaped dual dog lead on a 3 tonne carabiner to the D ring. The D ring is bolted through the floor to a 3mm 100X100mm spreader plate and 4 stainless mate set screws with stainless double nylon nuts and penny washers. They lie on the floor just behind the seat backs of driver and passenger so shouldn’t present a missile issue in the event of a prang! On top of that, they are more likely to survive the crash. Both wear full chest/leg harnesses as standard issue. Was quite an easy DIY fit and cost all in about £10 (we already had the dog lead and harnesses). You will need a battery operated drill, slotted screwdriver, chisel, socket set and an assistant! Simples!