Has your dog recently had puppies? Or is your dog an unspayed female recently in heat? Or is your dog pregnant? These could contribute to what your seeing but have different reasons, some serious. However, your dog could have a UTI or if it is not spayed it could have Pyo, which is a uterine infection, if left untreated it could kill her, the symptoms of pyo is an accumulation of pus in the uterus. In any event pus is not normal, unless what your seeing is a mucous plug from a very pregnant dog. Please go to the Vet.
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