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With his fair-haired mop and big innocent eyes, he'll be more beloved than his Downing Street flatmate could ever hope for.

This is the Downing Street dog - a Jack Russell-cross puppy who arrived today (Monday) in Boris Johnson's flat above No11.

Just weeks ago the 15-week-old, who is yet to be named, faced being shot or drowned after being abandoned by a south Wales puppy farmer.

But he was saved by a volunteer-run rescue charity in south Wales - and has now been plucked to stardom by the PM and his partner Carrie Symonds.

The puppy's been specially prepared for life with No10 moggy Larry after aides feared a clash between the two pets.

The young pup has spent weeks in foster care with an anonymous volunteer - where he housetrained alongside a cat.

The pet was abandoned by a puppy farmer for having an undershot and misaligned jaw, meaning he was unlikely to sell and could have faced being destroyed.

The Prime Minister chose him to highlight Lucy's Law, which will ban cruel third-party puppy sellers from 6 April 2020 in a victory for the Mirror.

Campaigning vet Marc Abraham introduced Ms Symonds to his "hero" Eileen Jones of Friends of Animals Wales - a volunteer-run rescue in the Rhondda - after No10 staff voted to have a dog.

(Image: IAN VOGLER/DAILY MIRROR) (Image: IAN VOGLER/DAILY MIRROR)

Ms Jones then sent the couple a shortlist of possible pooches, including the lucky terrier, before the final decision was made by the Tory leader and his partner.

Unlike 12-year-old tabby Larry, who belongs to No10 and has served under three Prime Ministers, the terrier will belong to Mr Johnson and his partner personally.

That means he will live in their flat above No11, which was remodelled during David Cameron's time in office, and will leave with them if he is booted out of power.

(Image: Eamonn M. McCormack)

Mr Abraham told the Mirror the adoption would highlight small, volunteer-run shelters and Lucy's Law - which will make it illegal for anyone to sell puppies and kittens in England unless they are the breeder.

Campaigners say the law, backed by the Mirror, will end the current situation where puppies can be bred behind closed doors in terrible conditions before being sold on.

The campaign got new momentum after being named after Lucy, a Cavalier King Charles Spaniel rescued after years of abuse as a breeding dog on a puppy farm.

Mr Abraham told the Mirror: "On behalf of grassroots campaigners I want to say a massive thanks to Andrew Penman and the Mirror for all your support.

"You have been there from the beginning and you never let up."