The concept of species is actually hard to define. It is not just reproduction:-
http://www.the-scientist.com//?articles.view/articleNo/38010/title/How--If--and-Why-Species-Form/

We still have no good definition of "species". Wolves and dogs mate easily, because dogs are really a sub-branch of the wolves they came from by human interferences in breeding:-http://www.sciencedaily.com/releases/2014/04/140414092144.htm