Simka: Should you continue to mix in high quality cat food if you start to feed Totally Ferret? NO The answer to the smelly urine. It could be the mixture. If one or both of the foods have corn gluten, soy, or high levels of wheat gluten, it could affect the urine smell as well as the pH. TF is high in animal protein and should help reduce the odor. Thanks for your questions. Sorry we were not able to answer sooner. DR. TOM of TOT FERRET [Posted in FML issue 0915]