Brisbane's Lord Mayor Graham Quirk has unveiled the newest addition to the Brisbane City Council's rodent control program – a three-month-old Australian Fox Terrier named Holly.

Holly is stepping in to fill the paw prints of former rat dog, Pepper, who is retiring along with her handler after six years of service.

Rat dogs at Ashgrove in 1949.

"This is an exciting day, we're showing the Brisbane community our latest little rat dog, Holly... Holly, at three months, has got a long career ahead of her.

"We have another nine months of training before she'll be fully functional, and do a great job in Brisbane," Cr Quirk said.