They should use poodles, or pugs. Definitely pugs. No one would ever shoot something this adorable. http://i.imgur.com/tVoJBno.jpg
I agree, they should change the breed of dog for the K9 killstreak. They should make the dogs un-killable and harmless, but VERY distracting. They should also add a Propaganda Plane for the same number of points as a CUAV. You prerecord a 30 second message that plays in both the enemy chat and game sound, so unless your enemies turn off their sound entirely, they'll hear it. You can say whatever offensive things that you want (because the Xbox Live enforcement team wouldn't actually ban anyone for using foul language anyway). I think these killstreak changes, as well as a few other random things, could spice up the game quite a bit.