Bathing Morkies--and more specifically, how often to do it--is a subject of debate. Some owners say they bathe their Morkies every couple of weeks, but groomers say this is too frequent and can damage the coat by washing away its essential oils. Perhaps a median time frame of Morkie baths every 4-6 weeks is best. Of course, it's owner's choice.
It's important when bathing a Morkie to use canine shampoo and conditioner, as the kind made for humans has a different pH and will irritate these dogs' skin. Morkies have pretty sensitive skin anyway--so the best Morkie shampoo is the hypoallergenic kind, which is usually free of dyes and chemicals the will make these dogs' skin itchy and dry. Overall, the best shampoo for Morkies includes brands like 4-Legger, Earthbath, and Isle of Dogs, all of which carry hypoallergenic products.
How to bathe a Morkie: first give the dog a good brushing. Your Morkie might be small enough to bathe in the kitchen sink; otherwise, a bathtub (which hopefully has a spray nozzle attachment) or an outdoor plastic pool using a garden hose will work. Wet the coat thoroughly, then apply a small amount of shampoo to the dog's back. Lather well, working downward and outward as you go. (And don't forget the legs, underbelly, and tail!) Clean the dog's face, head, and ears with a washcloth, then rinse the coat completely.
Towel-dry the coat, then continue drying with a hair dryer on its lowest heat setting, brushing the hair out with a small pin brush as you dry. Finish by giving the coat another quick brush-through to make it look clean and neat.