Singer Mariah Carey reportedly spends 28,000 pounds a year on grooming treatments for her pet dogs to ensure that they always look their best and are happy.

The "Beautiful" hitmaker regularly pampers her eight pet pooches by booking them into canine salons and gets them the best animal treatments, reports contactmusic.com.

"Mariah pays for all the spa therapies herself and doesn't expect any special treatment. Only her dogs get that. While prices start at 40 pounds for a simple trim, other treatments are extra and Mariah's dogs really seem to enjoy their wraps and full body massages," said a source.

"She pays for her dogs to travel with her on the first class on. And when they can't, she will check them into dog day care at salons Chateau Marmutt, Barkingham Palace or Pour La Pooch. She also employs a designated chauffeur to ferry them to and from at around 400 pounds a time," the source added.

Carey's favourite treatment to get for her pets is the popular blueberry facial and is supposed to exfoliate and reduce fur stains.

"She will always get the animals groomed before travelling - she likes them smart at all times. As well having them bathed and blow dried, Mariah is also very keen on the latest Los Angeles trend for canines - blueberry facials," said the source.