Accepted Answer

Your dog most likely has a condition called pseudopregnancy (false pregnancy). This syndrome is characterized by a display of maternal behavior and physical signs of pregnancy in middle to late diestrus of a nonpregnant bitch. After a female dog ovulates, she will develop a functioning corpus luteum and produce high progesterone levels, whether she is pregnant or not. Dogs with false pregnancy can show abdominal distention and mammary enlargement with secretion of a brownish serous fluid or milk (not all dogs will actually produce any milk). Some dogs will have vomiting, depression and anorexia. Many of them show behavior changes associated with pregnancy such as nesting behavior, mothering activity, restlessness and self-nursing.
It is recommended that bitches with suspected false pregnancy have an examination and an abdominal X-ray to rule out true pregnancy and pyometra (an infection of the uterus). Treatment for false pregnancy is usually unnecessary and the signs eventually dissipate. There is no association between false pregnancy and reproductive abnormalities. There are drugs that your veterinarian can prescribe to stop the mammary enlargement and lactation if you need to get her back in show condition.
I hope that this information is of help to you, and I wish you the best of luck with your dog. Please let me know if I can be of further assistance.

Dr. K

Expert:	Dr. K
Pos. Feedback:	99.6 %
Accepts:
Answered:	7/1/2008

Veterinarian

9 years experience as Veterinarian