All dogs in England will have to be micro-chipped from 2016.
The new rules will help missing dogs be reunited with their owners, but will it help crack down on dog owners who are irresponsible?
Ronke Phillips reports.
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.