Are you smarter than a 2-year-old?

OK, this is absolutely fascinating! Apparently, some dogs are as smart as two-and-a-half-year-olds with regard to verbal and mathematical ability and are as socially developed as teenagers. Kind of makes me rethink my cynicism with regard to the behavioral idea that learning principles are similar across species. But does this data really mean that dogs understand the complexity of language and mathematics? I'm not wholly convinced...