Pegasus was rescued from a backyard breeder by Dave Meinert when she was just a puppy. Most of her siblings were still-born, died shortly after birth or were born deformed. Pegasus is called a “double-Merle,” which means that both of her parents carried the "Merle" gene.
Merle is a color pattern but is not a color itself. Merle dogs can come with a variety of colors, but as a simple example, the most common is a blue Merle. This is seen in several breeds of dogs, but it is common in Australian shepherds. A blue Merle is actually a black dog that would have patches of gray throughout its coat. Merle is the gray patches in the coat, not the black portion. Blue Merle can vary from a light (almost a powder blue) to very dark (steel blue). A double Merle simply means that both parents carry this gene and the pup received it from both of them. Of all the puppies born to Merle parents, a quarter of them will be double Merle.
The result is a nearly white coat and often some health issues. Many are born deaf, but if the excess white does not affect the inner ear pigmentation, this will not be an issue. Another common health issue is eye defects and, sometimes, complete loss of vision. Pegasus came to Meinert with all sorts of cautions - she wouldn't live long, she would go deaf and/or blind, but Meinert decided that he would take his chances. As a filmmaker in South America who had worked with lots of animals, he decided to document her good days.
Although Pegasus does have health issues, it seems she has many good days as well. As Meinert grew attached to her, his work with her became deeply personal. His timelapse and other photos document their journey together.