I don't believe there are any modeling agencies out in Peterborough, but there is an external link to modeling agencies in the Ontario area listed under Sources and Related Links. If you're looking for modeling work, it may be difficult to freelance there. Having an agency will help increase your chances of finding modeling work.
JC Penney's does not have a modeling agency of its own. It simply turns to regular modeling agencies to recruit models for their campaigns. These are mostly commercial/print and catalog modeling agencies. Only models that are signed to such agencies will have the opportunity to be submitted to work for clients like JC Penney's.
Budweiser does not have any modeling agencies within its company but is rather a client that recruits models for its projects by contacting modeling agencies. There are also promotional models that work for Budweiser as independent contractors who may also get a chance to participate in further modeling opportunities. Sometimes Budweiser also holds modeling contests to look for fresh faces.
It sounds like you'll want to look into glamour modeling. There aren't many modeling agencies that have glamour modeling divisions but there are online glamour modeling agencies you may want to look into. You can do an online search for glamour modeling agencies in Portland and see what comes up.
There are no modeling agencies in the OC. You will need to seek out agencies in Los Angeles and San Diego.
Publicity. They act as your agent and they find you work that suits.
Legitimate and reputable modeling agencies are free and do not charge any upfront fees to its models. Nor do they "sell" classes, training sessions, or portfolios. If you come across an agency that tries to get you to pay upfront before signing a contract, they are not legit.
Petite modeling agencies are few and far in between because there is no demand for them but you can try a shot at commercial/print modeling agencies: - Angie's Model & Talent Agency
There are agencies that represent animals/pets for modeling shoots and acting work in TV, film and commercials. Los Angeles and New York are among the main markets that have animal talent agencies.
Skip modeling schools and deal directly with the modeling agencies. Here is a link to modeling agencies in Arizona, whose websites you can check out to see what their requirements are and what photos you need to send in: http://www.joeedelman.com/agencies/agency_az.php
If you are looking for modeling agencies in Newry, Pennsylvania, this link contains all the modeling agencies located in the Pennsylvania area: http://www.joeedelman.com/agencies/agency_pa.php
Casting agencies act as the middleman between clients and talent. They work regularly with photographers, companies, directors, producers and casting directors. They also work with the models and actors as well. However, casting agencies are not modeling or talent agencies.