Pyometra most generally influences middle-aged to older pets and also cats, yet I have actually seen periodic cases in pets simply over the age of one year old and it has actually been reported in canines as young as four months old. There are various other conditions that can trigger the uterus to swell, including hydrometra (water in the uterus) and mucometra (mucus in the womb), although afflicted pets aren’t usually as ill as those with pyometra. Medical treatment is occasionally made use of in young, or else healthy and balanced reproducing pets with an open pyometra.