Pet owners all know the fear and uncertainty of realizing their animal is sick. It can be hard to determine what’s wrong and whether it’s serious enough to warrant a trip to the vet. According to Dr. Fern Slack, cofounder of Uniquely Cats Veterinary Center, cats can be especially difficult to diagnose because of their evolutionary position on the food chain. “Cats are predators, but they’re also small prey, and small prey animals all obey one behavioral rule: If you’re sick, you don’t act sick until you absolutely cannot hide it anymore,” explained Slack, a veterinary physician who has worked solely with felines since 1993. “The minute you act sick in the wild, you have a target on your back.” Read more here.