I like Farnum's Mane and Tail. Use it on myself to! Isn't greasy, helps with tangles and you don't have to worry about getting it all out as you can also use it in a spray between baths if you need help with static electricity to. Used it for years on the horses before it became popular for humans.
I also use the Shampoo on Apache, Sassy and for Beau when he isn't going to a show.