Quotes vary partly because full groom is not a fixed term. As a baseline it should include: bath with appropriate shampoo, full blow-dry, brush-out, trim or styling to your instruction, nail clipping, ear cleaning, and a sanitary and paw-pad tidy. If a low quote quietly excludes the trim or the nails, it is not a low quote — it is a smaller service. Common add-ons: de-shedding for double coats, medicated or flea-and-tick baths, teeth brushing, dematting beyond light tangles, and difficult-animal surcharges. Dematting surprises owners most, because it is priced by time and severity.
Quality is easy to check at the end: comb to the skin at the armpits and behind the ears — the spots rushed groomers skip — check nails are short but not bleeding, look inside the ears, and confirm the sanitary areas are actually tidy. Do it while the groomer is still there, not after the van has gone.