Control of strays, greater control of animal abuse, control of dangerous dogs ie those not responsible can't have the dog.
Have a look in any paper/website and check out the pet prices, these aren't taxed, it's cash in hand.
One last minor item would be all cats (non working, domestic) to wear bells, it may help warn wildlife, how many small birds have turned up on peoples doorsteps?
I'm sure those responsible pet owners (such as myself) would have no problem with this law