The Australian supermodel’s labradoodle will star in a national advertising campaign.
The five year-old will be the face of designer dog fashion brand Dogside.com, with mini billboards placed on lamp-posts throughout Britain.
Elle, 46, who already has her own lingerie and cosmetics ranges, has often been photographed out walking Bella near her £7.5 million Notting Hill home.
The brand’s advertising materials boast that Bella is ideal for showing off its products, including leads, coats, scarves and bowls, for “today’s stylish urban dog”.
Dogside’s Flora Page said: “We approached leading models about their signing up their pets.
“Elle is a dog lover and was top of our wish list, so we were thrilled when she phoned up in person to say that she would love Bella to be the face of our brand.”
Celebrities owning labradoodles – a cross between a Labrador Retriever and a Poodle also include Top Gear’s Jeremy Clarkson and Richard Hammond and comic Graham Norton.
Beverley Cuddy, editor of Dogs Today magazine, voiced fears about the high-profile ad campaign. She said: “When Paris Hilton took her Chihuahua everywhere, there was a rush in sales of handbag dogs.
“Adopting a celebrity’s hairstyle as they chop and change is fine but acquiring a dog for fashion to mirror a celebrity idol is disastrous. Lots of people chuck these dogs out after a few months.
“Having a labradoodle is becoming a fashion thing and they already cost more than £1,000 for a puppy more than pedigree dogs and are attracting unscrupulous breeders.
“This will not be any less of a trend by Elle Macpherson’s dog becoming a supermodel.”