He said eventually cats should be micro-chipped when they are brought in to be de-sexed.
Wellington cat owner Kent Duston said he was disappointed the committee had pushed through the proposed bylaw.
He said the council had failed to give specific examples micro-chipping was the best option.
"The council is yet to provide any evidence that even if they did microchip every cat in Wellington, that it would somehow reduce cats predating on wildlife."
Duston said he had sought legal advice from top lawyer Mai Chen and it was his understanding the council does not have a legal right to protect wildlife.
"Until it is given that power it really has no ability to regulate in this area."
Other changes to the bylaw include reducing the number of chickens allowed on a property and banning people from feeding pigeons in the CBD.