Humans share around 99.9 percent of their DNA after all we all are humans and only a small amount is what makes you, you. Chimpanzees are 97% similar to humans. Cats have 90% of homologous genes with humans, 82% with dogs, 80% with cows, 69% with rats and 75% of mouse genes have equivalents in humans. And about 60% of chicken genes correspond to a similar human genes