The short answer for a Dutch rabbit
The grooming mistakes that harm a Dutch rabbit are bathing her, washing her with products made for dogs or cats, tearing out moulting fur, and cutting mats away with scissors against the skin. A Dutch rabbit has a short, smooth coat that largely maintains itself, so almost all grooming damage in this breed comes from doing too much rather than too little. Her skin is thin and tears more easily than owners expect, and she has no need of water on her body at any point in normal care. Gentle brushing during a moult and spot-cleaning a dirty patch are the whole job.
Bathing a Dutch rabbit does real harm
Putting a Dutch rabbit in water is the most damaging grooming mistake on this list, because a soaked rabbit loses body heat fast, panics in a way that can injure her back, and may stop eating afterwards from the shock. Even a shallow butt bath for a messy rear risks chilling and stress, and wet fur around the rear mats tighter as it dries. Clean a dirty patch instead with a cloth dampened in warm water, working only on the soiled fur and drying her thoroughly afterwards. If her rear is repeatedly dirty, the cause, often diet or difficulty reaching, needs a vet's input rather than repeated washing.
Products and tools meant for other animals
Shampoos, flea sprays, and powders formulated for dogs and cats do not belong on a Dutch rabbit, whose grooming habits mean anything on her coat gets licked and swallowed, and whose skin reacts to products a dog would tolerate. Scented sprays and dry shampoos marketed generally for small pets are also unnecessary on this breed's self-cleaning coat. The same caution applies to tools: stiff slicker brushes and metal combs drawn hard across a Dutch rabbit's short coat scrape skin that has almost no undercoat cushioning it. A soft brush or a dampened hand during moulting lifts loose fur without raking the surface.
Pulling moulting fur and cutting mats
During a heavy moult a Dutch rabbit's coat comes away in tufts, and the mistake is gripping and pulling at a tuft that is not ready, which hurts and can tear a small flap of skin with it. Loose fur lifts away with no resistance; anything that resists is still attached and should be left for the brush over following days. The scissor mistake is worse: fur mats sit directly on skin that tents up into the mat, so blades slid underneath cut the rabbit, not the tangle. Tease mats apart with fingers, or have a vet or experienced groomer remove a tight one rather than gambling with scissors at home.
Over-grooming a coat that needs little
Brushing a Dutch rabbit daily with enthusiasm wears the coat thin and irritates the skin beneath, and plucking at the marked pattern areas does not improve them, it only stresses the rabbit. This breed needs brief brushing once or twice a week during a moult and hardly any outside one. Handling that ignores her signals, such as continuing to brush a rabbit who is thumping, struggling, or trying to leave, also counts as a grooming mistake, because stress alone can put a rabbit off her food. Short, calm sessions she can walk away from between sections keep grooming safe.
A safe routine the whole household can follow
For a Dutch rabbit, safe grooming is a short list: a soft brush during moults, a damp cloth for a dirty patch, fingers only for loose tufts and small tangles, and no water, no borrowed products, no scissors near skin. Anyone new to grooming her should be shown the list before being handed the brush, since most injuries come from a helper applying dog habits to a rabbit. Broken skin, a scissor nick, or persistent sore patches after grooming need a vet, not home experimentation. Writing that routine into KinsLe through Care Teams, where each helper confirms the same gentle steps, keeps this Dutch rabbit's coat care consistent no matter whose turn it is.