Kidney failure after pyometra surgery will cause symptoms such as poor energy, loss of appetite, vomiting, bloody stools, thirst, accelerated breathing, frequent urination, etc. Generally, dogs will develop pyometra in the late stages if not treated in time. In the case of kidney failure, if your dog shows similar symptoms, it is best to send it to a pet hospital for examination and treatment immediately to avoid delaying the condition and risking life.