Once a wanton wiener dog, Dennis went on a diet and is now a happy shadow of his former self after losing more than 75 per cent of his body weight.
Less than two years ago, Dennis weighed in at a whopping 25kg - about the size of four or five more-typical miniature dachshunds, which is what he is.
A series of "before" photos show Dennis resting on rolls of fat, his head seemingly too little for his blob of a body. He couldn't take more than a few steps without being out of breath.
Then Brooke Burton adopted him from a relative who had fed him burgers, pizza and other human food, and didn't pay much attention to the dog's big belly.
Burton, a 26-year-old student, recalls how emotional she became when she first saw Dennis in June 2013, and then persuaded her relative to give him up.