Very untrue. Dogs do get attached to you and will become very depressed if you left them for a few days in the care of another person you trust. I could believe the above statement on cats, but dogs don't instantly forget despite what some people think. Maybe if you were it's pack for a month it could forget easily enough.
I'm sure this is still entertaining for some of our more childish members, but most of us are sick to the back teeth of this constant re-hashing of really old news. It's both infantile and it's quite definitely entered into the realms of harassment, now.