She said it was possible a dog fighting fraternity had moved into town.
Mrs Johnson said they wanted to get people to be more vigilant about their dogs' safety and what was going on in their community.
"We are asking people to be vigilant about where their dogs are, making sure their gates are secure and if they see someone unusual or an unusual marking to get in touch."
She said it was also a reminder for people to make sure they reported their dogs if they went missing as most were microchipped.
"We just want to try and stop it. If we catch people in the act we can prosecute them."
Mrs Johnson said if people were stealing the dogs to be used as bait it was "very concerning".
"It's a part of your family. It's like stealing a child."
Police acting area crime prevention manager for Rotorua Senior Sergeant Nicky Riordan said the police hadn't noticed any particular spate or pattern of offences.
"From time to time we do have dogs reported stolen. The breeds vary so it's difficult to draw conclusion as to why they are being stolen."
She said police encouraged owners to report any dog thefts.