Most docile dogs tend to be very relaxed and calm by nature. The only thing about grooming that seems to bother your laid-back Lassie is the shiny tools and brushes used to get the job done. Your pup probably thinks the only grooming she really needs is what little she does for herself. While this does actually help keep her clean, it doesn't really get her as clean as she should be--or trim her hair.
No matter how docile a dog is, there is something about being groomed that seems to upset most. The more time you take letting your furry friend get used to the tools and making the whole task seem like fun, the easier it will go. Think of this as the perfect time for the two of you to bond.