An intelligent system is designed that can diagnose if a dog has been infected by ParvoVirus or not depending on the symptoms seen in the dog. It is implemented in 4 different kinds of systems ; Rule - based system using JESS rule engine, Fuzzy Logic using JESS, Bayesian Networks using Netica, Influence Diagrams using Netica. The projects done as a part of coursework in the Course CS-514- Applied AI - Spring-2018.