One of the animals whose impurity has been discussed a lot in Islamic jurisprudence is the dog. Most Islamic schools have accepted dog impurity, Although there are differences regarding the impurity of dogs such as whether hair, wool, bones and teeth are also impure. 

On the other hand, various bacterial diseases can be transmitted to humans through dogs and cause diseases such as leptospirosis, campylobacter and salmonella, which is a reason for the validity of the issue of dog impurity in Islam from the point of view of medical bacteriology.

Conclusion: Consistent with the religious traditions about dogs, despite the fact that dogs are loyal animals and all animal rights must be respected, their impurity is undeniable, and if there is a ruling on this issue, there are many reasons and wisdoms in it. Many parasitic diseases in humans, such as leptospirosis, campylobacter and salmonella etc., can be transmitted to humans through the feces, urine and saliva of dogs. Therefore, regarding dog impurity, it is suggested to pay attention to religious and health points.