
This is an interesting topic. A friend has a litter brother of my dog (GR's) who has one retained test*cle, I asked for advice about this on a thread recently. The dogs coat is quite different to my girls, much thicker with a dense undercoat, more like the coats my previous spayed girls had. This could be that he has inherited a different coat type to my dogs, but if his descended testicle isn't working properly, perhaps, as suggested above, his coat is more like that of a neutered dog.