This is a good question, I was wondering the same thing! I have a spendy pair of boots that I bought for riding in, but since they are so comfortable, I wear them for everything I do with horses. I usually wipe them in the grass or rinse them off with the hose.....haven't oiled them because im out at the barn so much wouldnt be no point. However, if I was mucking stalls, I wouldn't wear them ;)
There isn't a lot you can do with suede. Regular leather boots can be taken care of the same way you do your saddle or even a regular pair of shoes.
For regular leather and if you use them for everything out at the barn, I would start with some spray glycerin and then some oil. If mine get really scuffed up I'll just clean them with some water and use shoe polish.
The only thing I know to do with suede is to brush them well preferably with a brass bristle brush. What I've done is to treat them like regular leather and spray and oil them; but you will not have that nap anymore that makes it suede.
I have a pair of thoes too by justin they have a creepe(sp) soul. I live them mine were really light colored.
I oiled them and it did darken them up a bit. (but I liked them better)First I dusted them off they seem to hold dust a bit. I used a rag with oil on it and than used a stiff brush to "fluff' the newly oiled suede type material. I than waited a day and sprayed a waterproof type spray on them, it looked like they were going to darken up more, but as soon as it was dry they went back to color beofre spraying. Not saying this is how it should have been dun but it worked good for me.
I have a pair of Ariat pro babies that I just love. They are the plain leather type.
I'm not sure if I'm properly caring for them but what I did was to use mink oil on them, it darkened the leather but it has also protected them and made them supple. When they get dirty I wipe them down with a wet paper towel, let them air dry and oil them again. They're not dead yet and are semi-water proof, I wouldn't stand in a puddle but wet grass or a spray from the hose doesn't bother them.