I have a similar device to the Coat King. We've found that trimming down Bonnies neck and chest lets the excess drinking water flow off her easier. That way the water doesn't tend to end up on the ceiling in the volume it had before she was trimmed, when she shakes her head after drinking. (Bearing in mind she MUST be around someone first.)
After watching some more videos the thinning and curved sheers are a must. However an electric clipper set would be useful for sanitary trimimg.