The article discusses the 15 fattest animals ever seen in the world. From domestic pets like cats and dogs to wildlife like bears and walruses, these animals have achieved remarkable levels of obesity. Some of the animals included in the list are an obese cat named Sprinkles, a 1400-pound boar known as Big Bill, and a hefty walrus named Sivuqaq. These animals have gained weight due to various reasons such as overeating, lack of exercise, or medical conditions. The article also highlights the importance of proper diet and exercise for animals to maintain a healthy weight and avoid health issues associated with obesity.

Overall, the article presents a fascinating look at some of the heaviest animals in the world and serves as a reminder of the importance of maintaining a healthy lifestyle for all living beings.