The organization filed this week for an emergency injunction, essentially asking the court to suspend the ban until the full legal case is heard - which could be months from now.
"If our injunction is granted," Alanna Devine, advocacy director at the Montreal SPCA, tells The Dodo, "it would put the brakes on everything."
But, she admits, getting that injunction will be "a bit of an uphill battle."
The earliest the group could get a judge to hear the case for an injunction is Monday - the same day the ban takes effect. But if the judge sides with the SPCA, the new law will be suspended immediately.