They have to be professional tanning of the best quality. If the leather is well tanned, it should last for the rest of its life, it will never crack.
Choose from a renowned region of the cowhide world, such as Argentina, Brazil, or France. It is better to choose a skin no barbed wire and the owner's stamp. If you choose one from Europe, it may have stamp marks, this is the European Union law in the agriculture.
Make sure it will give it a nice leather smell. The hair has to be treated with best chemicals available for hair don't smell and do not fall off easily and last for a lifetime
Look at the cut and the hair measurements.
The best cowhide rugs in the world are »tanned«, if you want your cowhide rug to be extremely durable for many years.
Cowhide rugs can be made to measure with a beautiful «patchwork»And make a stunning accent rug, perfect for decorating needs.
More information- Leather rugs, most fashionable rugs
Source- Cowhide rugs