My female pug 5 yrs old has been spayed last year in march. But she is having very white discharge on her vulva after she pee. This has been going on from last year. Her vet gives her antibiotics then for 1 or 2 months it gets better and then again discharge starts coming. We have had her ultrasound done there were sand like struvite crystals but there was no ovarian remanant. But the vet says it could be pyometra and could not be visible in ultrasound. We also had her discharge tested. It was ecoli and streptococcus.What should we do now? Is it pyometra? She had mucus in her uterus when she was spayed.