Yes and no....

A species is a group of organisms characterized by anatomy (sharing like/similar features) and can only breed sucessfully with each other (that is they are reproductively isolated either physically or geographically and produce offspring which are reproductively viable)

Then there are hybrids which are combinations of 2 species which may not be reproductively viable.
A mule is an example of a hybrid; it is a sterile animal (cross of a donkey and horse) incapable of reproducing.

Sub-species are organisims that are geographically seperated but could be considered members of the same species based on their characteristics; you could move a member from one region, mix it with a population in another region and not be able to tell the difference.

Dogs are speciated, but then there are hybrids of the species (mixes) which may or may not be reproductively viable.