How fit is your pet? It's probably not a question you ask yourself often but you really should.

The Lost Dogs' Home has launched the inaugural Pet Fitness Challenge, aiming to raise money for animals in need.

You can commit yourself and your four-legged friend to 15, 30 or 60 minute exercise sessions each day and hopefully raise lots of donations for the cause.

"We know obesity in our animals affects both dogs and cats, this is a great opportunity to get on the front foot and show your pets some extra love, care and attention," says Lost Dogs' spokesperson Suzana Talevski.

"Commit to exercising with your pet for 15, 30 or 60 minutes every day and help us find forever homes for the dogs and cats in our care. We can’t wait to see who Australia’s fittest fur family is."

Could you and your pet be Australia's fittest?