I, personally, like to use
Ice on Ice and Pet silk as leave in spray conditioner. Some times if i am out of my leave in I will just dilute one of my rinse out conditioners, my favorite of those is Coat Handler's it is a 10-1 so I only need a little bit of conditioner to water. Everyone usually has a different mix of products that they like best. Alot depends on the type of coat that your yorkie has
