We meet the adorable pint-sized pups beginning their journeys - the Police R litter, some cute mobility pups, baby biosecurity beagles and Labrador guide dog pups.

It's assessment time for mobility dogs Brooke and Arthur, while biosecurity beagle Luigi faces his first big test.

Which Police pup will make the cut - go-getter Reign, or her handsome brother Ruger? Plus, we find out how guide dog pup chompy Kato is going.

Police pup Reign and her bestie Ink start their training course, mobility dogs Brooke, Blake and Arthur train behind bars and the Biosecurity beagles face their airport assessments.

Biosecurity beagle Iko is itching to get started, we find out what skills mobility dogs Brooke, Blake and Arthur are picking up in prison, and it's decision time for Police pup Raptor.

It's a big day for Police pup, and now dog, Ink; we catch up with mini mobility pups Frankie, Pearl and Ava; and it's assessment day for guide dogs Carley and Clark.

Biosecurity beagles Joplin and Ice test the chemistry with their handlers; mobility dogs Brooke, Blake and Arthur finish their stint in prison; and guide dog Winnie's puppy raiser couldn't be prouder.

Will biosecurity pup Ally make the grade? Plus, there's a change of career for Guide dog Wilson.

We meet boisterous Police pups Yarcov and Yates, Mobility dogs Hank and Max meet their matches, and there's a star performance from guide dog Wistar.

Season Finale: Our Biosecurity beagles graduate and get on with the job; we catch up with Police pups Yarcov and Yates; guide dog Wistar proves she's ready for work; and mobility dogs Hank and Max take up full time jobs in their forever homes.