Bedfordshire and Hertfordshire Police forces have agreed to collaborate in three new areas in a move which aims to save £1m a year.
From 1 April this year the police forces will have a joint dog section, professional standards department and scientific services department.
In 2007 the two forces set up a joint major crime unit which has a proved an "enormous success", said the police.
The £1m saved will go into frontline policing across the two counties.
Peter Conniff, chair of Bedfordshire Police Authority, said these new developments would build on the success of the major crime unit.
"We are making good progress on developing the collaboration between the two forces," he said.
Stuart Nagler, chair of Hertfordshire Police Authority, said: "We will continue to explore with Bedfordshire and other police authorities, further opportunities for collaboration that would provide measurable and sustainable benefits to Hertfordshire."