We had our dog groomed yesterday. They sent home a sheet that told us everything they did to him - cut his nails, cleaned out his ears, trimmed his hair, etc. It told us his ears looked great (no infections). I love that they check that! If they find something wrong, the vet is right there and they will let us know if there are any issues.
I also like that you only pay for what services they do - like he didn't get a haircut all over yesterday, so we just paid for a trim. Sometimes I will give him a bath at home and then they don't charge me for that. Their prices are very reasonable!