Dog instincts: They remember their wild relatives. Not having enough food worried them. They had to protect it to survive.
Early Puppyhood Learning: Young puppies sometimes battle for food with their furry siblings. If kids learn this young, they may do it as adults.
Besides food, dogs defend toys and other good goods. This is especially true if they've been short supplied.
Defense: Some dogs protect food to keep others out. They want to eat calmly, away from people and animals.
Fear of Losing Food: Some dogs are deeply afraid. They worry about food theft.
Environmental Factors: Injuries, mistraining, and scary experiences can make dogs defend food.
The ruffled and curlier look and bitterer taste distinguish curly kale from “regular” green kale.