A massive manhunt has been launched for a missing 36-year-old mum-of-two and her pet French bulldog after they disappeared during an afternoon walk.

Picture shows Sandra K., 36, undated. She has gone missing in Mansfelder Grund-Helbra, Germany. Note: Private photo taken from local media. (Newsflash/NX)

Sandra K., 36, was last seen in Benndorf, in the Mansfeld-Sudharz district in central Germany on 21st April.

Friends and family raised the alarm when animal lover Sandra, who has three other dogs, did not return to the family home that night.

One pal told local media: "Sandra would never leave her dogs and children alone for so long.

"The fact that she doesn't answer her mobile phone is also completely out of character."

Picture shows Sandra K., 36, and her dog, undated. She has gone missing in Mansfelder Grund-Helbra, Germany. Note: Private photo taken from local media. (Newsflash/NX)

Her two children are currently being looked after by family members.

Police using sniffer dogs and thermal imaging cameras on a drone have failed to find any sign of her.

Her sister, not named in reports, pleaded: "We hope that as many people as possible will support us in the search for Sandra.

"We want her back with us as soon as possible."

Sandra is described as slim with shoulder-length brown hair and was wearing a pair of black Nike trainers when she vanished.

(Simona Kitanovska / newsX)