Hogpaw

I have been out of leather crafting for several years. I need to make some holsters for my hammers. I cut the first one out and the leather seemed bad. It would tear like paper. I checked the hide all around and it tore on all sides. I cut a piece off, wet and tried to fold it and the grain side cracked bad. With this hide stored inside, could e leather have gone bad. I probably haven't touched it for 10 years.