One thing that you can do is ask to stay and watch them groom your baby, the first time, or any time. If they refuse, keep looking

I got lucky with our groomers, they are a grooming school where students usually do the dogs under supervision. They all do great work, and they're all sweet to my girls, but my little Luna is a spaz, and the only gal that can do her is the owner. She's hearing impaired and for some reason, Luna behaves for her and ONLY her

We call her the dog whisperer