I think this started from a CNN article:
http://security.blogs.cnn.com/2012/01/06/when-a-dog-isnt-a-dog/
Most of the dogs come back with their handlers. I think there are few dogs actually left behind -- but I don't have any specific facts one way or the other.
Yes, there are amendments from the original bill Clinton signed in 2000. These two are currently pending in the House and Senate. Please pledge support, they need to pass. The bills currently pending are HR4103 (House) and S2134 (Senate). This is the recent video by Anderson Cooper on CNN. Send to everybody you know.