i just got another yorkie about 3 weeks ago besides eating each others food sometimes i don't see any cons except the puppy isn't potty trained yet but having an older yorkie who is helps alot! i say go for it! they aren't soo big so carrying 2 around isn't really difficult matter of fact i can carry both of mine u with one arm . they love each other even if the older one acts like she doesn't at times if you seperate them or pick him up where she can't see him she instantly looks for him!!
so princess & truffle say yay go for it!!
http://img.photobucket.com/albums/v2...1/IMG_2146.jpg http://img.photobucket.com/albums/v2...1/IMG_2141.jpg http://img.photobucket.com/albums/v2...1/IMG_2187.jpg
pics of my 2
plus if you get the same sex puppy you can let them use whatever doesn't fit your older yorkie anymore! collars clothes...so on