My dog did a bit of modelling, I used to work in a kennels and a friend there knew a dog clothing company that needed a pug. The pay isn't great tbh but it is good fun. Have you tried Googling local dog modelling agencies? There was an article about this in "Your Dog" magazine this month.
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http://www.12yard.com/2012/05/08/woof-woof/
I think you have to email them for an application form.