Thickening of the Uterus Lining and Fluid-filled Sac in Dogs

Pyometra is a potential life-threatening infection of the uterus that occurs most often in intact females over 6 years of age. It is characterized by thickning of uterus linings. 

Cystic endometrial hyperplasia, on the other hand, is the medical condition which is characterized by pus-filled cyst inside the dog's uterus, causing endometrium to enlarge (hyperplasia).

Prognosis is positive for both conditions unless dog's cervix is closed. In such circumstances, the condition becomes life-threatening.

Common symptoms associated with this condition are

Abdominal distention (from an enlarged uterus)

Vulvar (vaginal) discharge

Closed cervix



Lack of appetite


Frequent urination

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