False pregnancy, also known as pseudopregnancy, is a condition that can occur in female dogs that causes them to exhibit symptoms of pregnancy even though they are not actually pregnant. Dogs with false pregnancy may begin to exhibit nesting behavior, such as digging and rearranging their bedding, as they prepare for the arrival of puppies. The mammary glands of a dog with false pregnancy may become enlarged, and milk production may occur. Dogs with false pregnancy may begin to produce milk even though they are not nursing any puppies. Dogs with false pregnancy may become more anxious, restless, or protective as they believe they are caring for puppies. Some dogs with false pregnancy may experience a decrease in appetite or become lethargic. Similar to pregnancy, some dogs with false pregnancy may experience digestive issues such as vomiting or diarrhea. While false pregnancy is not harmful to the dog's health, it can be a sign of an underlying hormonal imbalance or other health issues.