It could help in the reduction of methane emissions.
There are so many homeless pets already so why not make pet breeding only legal after those in shelters have been re-homed? Also reduce pet food production and concentrate more on feeding them on unwanted food from the table. Surely there is much healthier meat in what people throw away than in any cat or dog food anyway? Also think of the carrot ends, apple cores and things that animals like rabbits could enjoy and prefer.