I posted a reply but for whatever reason, they're not showing up.
WestJet and AirCanada both allow only 1 dog per person in the cabin. I called them on your behalf and found out. Their websites have toll free numbers. AirCanada kept me on hold for ages, but WestJet was really fast in regard to a customer service rep.
1 dog per carrier and only 1 dog per person. If you have a companion with you they may also have 1 dog though.