In Islam, why dogs are considered impure animal?
All creatures are the creation of Allah Ta'ala and do deserve the recognition of being a creation of the Almighty. As much as Muslims detest even the sight of pigs - it is the creation of Allah Ta'ala - and because Allah has placed life into it, we cannot inflict pain nor torture the pig. Similarly Allah Ta'ala created the dog from among His creation. This does not mean that we should love the dog. It is perhaps the indoctrination of the Western culture that 'The dog is Man's best Friend'.