For me it's long nails and mats. My other pups nails I keep fairly short, but Nikka's nails are a lot longer than I'd like, but she's so nail shy I can't clip them, she requires a trip to the vet. Last time they had to muzzle her, it took 2 techs to hold, 1 to clip and still took them about 45 minutes. They were almost ready to give her a tranquilizer just to mellow her. She'll let us do anything else, needles, clean teeth, ears, whatever, and usually adores the vet and techs, but don't touch her nails.