There is a company in Canada (and the US, of course) marketing a cell phone for pets - see http://www.petsmobility.com/.
Owners can call and talk to their pet ("Hi, how yer doin...had a good day?") or use GPS to find out just where they are right now ("Oi, how many times have I told you not to crap in that nice Mrs Minotff's back garden, Rover..").
Using this technology, another company is marketing games for pets - two barks and you move onto the next level.
I dont know where all this will end, but badly is my guess. I can just see dogs gathering to swap phones and annoy the hell out of their owners...