they ranged from normal "pet-size" to medium to medium-large to gigantic. the larger ones had a stacking buff that read: "test grow - 7 days remaining." and yes, all of them are barking nonstop.
the funniest part about all of this is that there is a group of stormwind royal guard that pats right into the mob of perky pugs. i can just imagine what must be going through their minds as they ride through, 'i better not be assigned to poop-duty after this shift.' :P