Mr Layland, 26, has been in the police five years. Along the way he has fostered three dogs which have all gone on to be operational police dogs - Odin, Asta and Kaino.
It was taking on Odin as a puppy and attending a puppy course in 2010 that sealed the deal for Mr Layland.
"That two-week course cemented in my mind that I wanted to do this. I've been brought up around dogs.
"Working by yourself you get to attend all the good jobs. There's nothing more satisfying than you, the offender and the dog - you track and catch them." For now Mr Layland and Coi can't join in on those jobs.
They must wait until she passes all her exams in May they spend every day training to track, search buildings and bags and on obedience.
"I'm confident she'll pass. She's looking good at the moment. Out first goal is to get her up and running. The second is to work as hard as we can," he said.