Purdue University students are working on a brace to help older dogs with hip problems.

The students came up with a device called an exoskeleton that fits over part of a dog's back, helping it put more weight on its back legs while using less pain medicine.

Students in a mechanical engineering senior design class created the device last year, but this year a new class is making it lighter, stronger and more comfortable for dogs to wear.

Students and researchers from the university's School of Veterinary Medicine are testing the brace on a dog named Stella, who has hip dysplasia and struggles to walk across a room without pain medication.

A computer processes a video of the dog to show how well her joints function with and without the brace.