Surely they will have some common elements between them. Find a way to make a pet-centric CMS.
Eventually you will have a flexibly configurable CMS that you could sell to many local businesses.
But you are better off writing a couple of hardwired, dedicated CMSs, then to try writing that flexible one from the very start.
My very first shot at Warp Life for iOS, a Conway's Game of life implementation, had a frame rate of about two per second. Now it's about 8,000 per second.
Now that I've gotten it up to 8,000 per second, I'm getting some real insight as to how to optimize it.
There are other reasons one would want a Life App than because it's fast. MY Life App is for those who care about the speed; not everyone does.
We're looking to expand into a subscription service that provides a CMS w/ dog-centric themes to our customers.
Shoot me an email, we should talk. Email address on my profile.