All low shedding breeds (with the exception of hairless dogs) require frequent grooming. How often you need to groom will depend on the coat. I recommend monthly grooming for Bichons, and Cavaliers can go up to twelve weeks if they don’t have a cottony coat. Most Cavachons do fine on a six week schedule, if the hair is kept under half an inch long (ears and tails can be kept longer, as they don’t tangle as easily).
Maintaining a fluffier coat will require weekly bathing and brushing. All breeds need their nails done every 3–5 weeks to prevent the quick (blood supply) from overgrowing. Once the quick lengthens, it can only be shortened by very frequent trimming/filing for a few weeks or months. It’s much easier to keep them short so you don’t have to worry about that.
Be sure to research the cost of grooming in your area before deciding on a dog. The prices can be quite expensive, and going longer between grooms can drive the cost even higher (not to mention it puts your dog at risk of matting, cuts during grooming, and skin disorders). I would advise any dog owner to learn more about dog grooming and try their hands at it too.