"It is in response to the Children's Commissioner's report that said significant numbers of young people are at risk of being exploited.
"I think (the risk) has always been there but we have not been as aware of it as we are now."
More top news
The 18-month-old puppy lives with owners Chris & Gillian French and their 10-year-old daughter Mia at the Mitre pub in Richmond-upon-Thames.
Detectives are hunting two suspects after the 23-year-old victim was left with a broken rib and a deep cut to his lung.
Transport for London expects 34,000 vehicles a month will be liable for the Toxicity Charge on top of the £11.50 Congestion Charge.