the word dog can be used for too many different things. look.

http://www.moveoneinc.com/blog/wp-content/uploads/2011/12/Dog-2.jpg

also look

http://www.dogbreedinfo.com/images17/NorthernInuitDogFreya14wks.JPG

they are both dogs. and they're as different as crabs and fish. also look at this next one

http://www.leckhamptononline.co.uk/wp-content/uploads/2010/06/stbult.jpg

and

http://www.kennels.co.uk/images/W.StBernard.jpg

not even nearly the same thing. what needs is to have some new words.

http://animal-photography.com/thumbs/smiling_odd_eyed_border_collie~AP-1BWCWP-TH.jpg