My wife is a dog breeder in Canada. She was starting to get worried about her dependence on Kijiji as the only site to advertise her puppy litters. Kijiji is a de facto monopoly due to network effects and they have slowly been increasing the fee they charge to post. In addition all other alternative sites are terrible - filled with pet scams.
I built CanadaPups.com as an alternative. Free to post. Started a couple of years ago. Growing slowly but consistently. I pretty much spend my nights afterwork fighting pet scams. I wanted to hire a web designer but she prefers the site to look "hand-made" for a softer feel… ok dog brown color it is then :). Any constructive feedback is welcome! Trying to grow it.