From the http://www.msnbc.msn.com/id/26860866/

Country songs are filled with anguished lyrics about cheating wives and husbands. But sometimes it’s not always people who are doing the leaving and breaking hearts. Dogs and cats can also cheat on their owners, leaving their own homes in pursuit of something better, or different. And perhaps more painfully, some pets carry on affairs right under their owner’s nose.
Audrey Pavia of Norco, Calif., has an 8-year-old Pembroke Welsh Corgi named Nigel who forgets all about her when their friend Arden Moore visits.
“Whenever I know Arden is going to be around, I prepare myself emotionally for what's coming,” Pavia says. “As soon as Arden enters the room, Nigel is no longer my dog. All his attentions and affections are completely focused on her. My obedient dog who normally watches my every move doesn’t exist when Arden is around. He is her dog. I am invisible. And if I insist that he listen to me — which I must do with an uncharacteristic stern voice — he looks at me with great disdain. I can almost hear him saying, ‘Geez, I wish you'd get lost.’ ”