This strength is critical when making dog gear, and it is a massive factor in why good gear costs what it does. If you are making a standard six-foot lead, you need a single, continuous strip of leather that is strong for the entire 210 cm. Due to the anatomy of a cow, finding a strip that long without stretch, weak spots, belly fat, or loose grain is incredibly difficult. You can only get that kind of consistent strength from the absolute premium cuts of a high-quality veg tan hide, which means a lot of the hide cannot be used for leads. That drives the material cost up significantly.
This is also why the cut of the hide matters so much, and why we use different tanneries for different products.
Our Italian leathers from tanneries like Conceria Walpier and Badalassi Carlo are primarily supplied as double shoulders. This cut gives you good consistency and is well suited for collars and shorter leads where you do not need an extremely long continuous strip.
Our American leathers from Hermann Oak and Wickett & Craig, and our English leathers from J&E Sedgwick and J&FJ Baker, are supplied as sides and butts. These cuts allow for much longer continuous strips with maximum structural strength. That is exactly what you need for long leads, training lines, and reins. It is the only way to get a full-length lead from a single piece of leather without splicing or laminating weaker sections together.