I don't know what it's like in the United States but in Canada, anyone can call themselves a dog trainer. Heck, anyone can call themselves a "certified dog trainer".. just print out a certificate and there ya go!

I teach private and group classes. I've never been certified (though joining CAPPDT is on my to-do list).. everything I know is through hands-on experience and trial and error. I've mentored with behaviorists and trainers and have gone to seminars, but I've never been certified.