The City of Brandon has a bylaw and all cats, just like all dogs are not allowed by law to run-at-large. Contact ACO @ BPS 729-2345. If you know who owns the cats, ACO, if they're doing the job properly, will inform cat owners of bylaw and proceed from there.
Cat owners only get away from abiding by this bylaw because people don't call to have bylaw enforced repeatedly. Dogs aren't allowed to do anything without ACO enforcing the bylaw and it's time cat owners are treated the same way.
If a cat is allowed to dig around and smell up my gardens, my dog should be given the same freedom all across the city in everybody's garden.
I've been known to torpedo cat turds back to the rightful property. I didn't want to be found in possession of items that didn't belong to me.