Several studies report successful fittings of tripedal quadruped animals with prosthetic devices, but very few report fittings of bipedal quadrupeds. None of these studies report how the animals were trained to use their assistive devices or how the device was developed. The research focus of this project was to develop a method to train animals to use assistive devices and measure their mobility in order to determine the success or failure of prototype design. The overall goal of the assistive devices for a bilateral front limb deficient dog was to increase the animal’s mobility. After eight prototype designs over the course of 10 weeks, a design suitable for a timed up and go test was achieved. The test revealed an increase in mobility.