Sometimes the digit that is comparable to our thumb is missing or in a position higher on the leg, such as a dew claw. All carnivores have long canine teeth and premolars and molars designed for removing flesh from carcasses. They have a digestive system designed especially for meat. All carnivores have anal glands which are used to varying degrees in many species for scent marking. In others, like the skunk and some weasels, these glands have developed to produce the ultimate defense spray.
Carnivores are fairly intelligent animals with well-developed brains.
They need this intelligence to outwit their prey or they would not survive. The smartest, strongest carnivores survive and pass those genes on to their offspring. As I have said, most carnivores are predatory and live on meat. There are a few however, that do not. The binturong, kinkajou, some civets and others live largely on fruits.