Your roommate has the right to use any pictures s/he took; in addition, pets have no "privacy rights". However, I suggest you take the ads to a local attorney for review and advice on any possible causes of action. The State Bar of California can give you a referral: www.calbar.ca.gov/
If we do not have a signed fee agreement I am not your attorney and this is not legal advice.
If the pictures were taken in the shared areas of the home, then you probably do not have an expectation of privacy there. If you really, really care that your dogs are being used in ads, then ask your roommate to give you some of the money he earned from the ads, or buy you dinner, or a bag of dog food for your model dogs.