The chairwoman of the Environment, Food and Rural Affairs Select Committee, Anne McIntosh has backed Government proposals to tackle irresponsible dog ownership.
But speaking to Daybreak she expressed concerns that changes would not be acted on quick enough.
She said: "The government should act before an attack happens."
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The memorial service will be attended by Prince Harry and Meghan Markle.
David Browning admits manslaughter by diminished responsibility but denies murder.
Four people have died and the suspect is still at large, police said.