Cracks in Leather
The only way to un-crack leather is to replace it. One approach that leather repair specialists use is to clean the leather and then re-color it. The result is that the leather will have a uniform appearance. The cracks will still be there but will be less apparent.
You can also have a leather repair professional replace the cracked areas and match the new leather to the original color. This works best when you are working with a panel of leather, for example on a car seat or the surface of a furniture cushion.
Dog and Cat Scratches
If you own a dog or cat, do not allow them on your leather furniture