I don't bring my dogs to groomers because of abuse cases and because Pepper had all of her nails all cut way past the quick when she went as a pup. I must say though that in 14 year of grooming our dogs by ourselves we still can't always aviod the occasional razor burn when using the short blades. Sometimes the dogs wiggle too much and you accidently cut them too short. I agree that razor burns all over the entire dog is a bad sign, but having a few red marks on the stomach is hardly evidence for abuse especially if your dog hates being groomed.