Leather is just a durable material as long as you maintain it. 
Yeah! It definitely takes some caring for. Both my phone case and my wallet are leather, and I have to be very vigilant about keeping them in good shape!
It also depends on the quality of the leather, there are different grades of leather so that also plays a factor.
That makes sense! I'm sure there's a lot that goes into making leather goods - from the inherent quality of the raw product to how it's processed and tanned.
Exactly, it could also depend on the breed of animal. Some animals have tougher hides than others.
Oh, definitely! I work in an industry that handles sheep (and various other fiber animals), and there's clear difference in skin/hide even within the same species! The same animal can be specialized for many different uses.
Wow, I just learned something new. Can diet and living environment have an effect on the hide quality ?
I'd expect so! Farmers and ranchers can control for a variety of factors to get an ideal product. Certainly nutrition and standard of living would have an effect. 
That's good to know. What does your industry do with the sheep hide ?
We actually work with the wool rather than the hide. The fiber is shorn from the body of the animal, so there's actually no harm at all to the sheep. We process the wool fleece to make yarn!