Suzanne, I never tipped the Petsmart groomers. In fact, I never even thought of it.
I dont really know anything about cocker spaniel grooming so i dont know if they're any good ornot. Im not always happy. he doesnt like other dogs tho and im not comfortable going thru Petsmart w/him. But Im thinking I might do it.
I dont remember what kind of dogs you have, but do they need grooming often? There is a dog place across the street from me that has the rooms where you can wash the dogs yourself. No grooming, just bathing. I took Toby there a couple times. the tubs are high and have a ramp up into the tub and a door slides shut.