A Tory MP has been fined after his puppy caused a stampede when it chased a 200-strong herd of deer in London’s Richmond Park.

Danny Kruger admitted losing control of his 11-month-old Jack Russell, Pebble, during a walk with his family on March 20, pleading guilty to causing or permitting an animal to chase or worry another animal in a royal park.

At Westminster Magistrates’ Court on Monday, prosecutor Dominic Hockley said: “On March 20 this year, Danny Kruger’s white Jack Russell dog, Pebble, chased a large herd of fallow deer.

“It’s been said it only takes one pebble to start an avalanche. In this case it only took one Pebble to start a stampede.”

Kruger, who was Boris Johnson’s political secretary before his election as Devizes MP in 2019, was on a long walk in the busy park with his wife and three children on the afternoon of March 20, when Pc Samantha Riggs spotted his dog running across the road towards a herd of around 200 fallow deer.

Hockley said the deer, many of which were pregnant, were left in a “panicked state”, while Pc Riggs called out for the owner, who was “at that point nowhere to be seen”, to bring the dog under control.

Volunteer ranger Duncan MacCallum said he asked Kruger to call his puppy back, “which seemed to spur him into action”, the court heard.

In footage filmed by a member of the public, Donald Milton, and the police officer’s body-worn camera, Kruger can be heard repeatedly shouting “Pebble” before putting his dog on a lead.

The MP, who lives in Hammersmith, west London, was said to have been “contrite and apologetic” following the incident, which lasted around 45 seconds, telling police: “I’m sorry, I had no idea, I didn’t see the deer. Anyway, obviously he needs to be on a lead.”

Jae Carwardine, defending, said Kruger’s “attention was momentarily drawn away” because his youngest son, aged seven, was tired after walking for around two hours.

“This was a brief lapse while juggling his responsibilities as a parent, quite understandable, but something Mr Kruger deeply regrets,” she said.

“Of course, he will take much greater care in the future.”

The lawyer described Kruger as an “avid dog walker”, while Pebble was said to be a “very friendly, good-natured family pet who interacts well with other animals”.

“Mr Kruger takes dog training and dog obedience seriously. He has trained Pebble and he has been effective in that training,” she said.

“He of course takes responsibility for the temporary loss of control of his dog.”

Deputy Chief Magistrate Tan Ikram fined Kruger £120 and told him he must pay £575 costs and a £34 surcharge, totalling £719.

He told Kruger: “The video says it all really, doesn’t it? You should have known better, especially in Richmond Park, where everyone knows there are wild deer.

“Your dog was not under control, he was able to frighten the deer and here you are in court today.

“The deer were clearly startled and frightened. It could have caused injury, fortunately it didn’t.”

The 2,500-acre park is London’s largest royal park and is home to around 300 red deer and 300 fallow deer.

Richmond Park’s manager Simon Richards said in a statement to the court there were 36 recorded incidents of dogs chasing deer over a four-month period last year, while around six of the animals a year are killed by dogs.

“Dogs chasing deer cause great distress and it often leads to physical attacks on the deer,” he said.