whats wrong with my pet sheep?

Nataloodle

New member
my pet sheep is about 5 or 6 years old. shes lambed twice. both times were twins. last season about (6 months ago) we put her with a ram and she got fat, and one udder swelled. but theres been no lambs!! and shes still fat. all our other sheep lambed about 3 months ago i think? my pet sheep also has a lump sticking out from her butt. not up - out. its quite big and takes up (width wise) her whole backside. does anyone know whats wrong?
 
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