Some Hamilton pet owners will need to get their pets re-microchipped after a possible fault was found with Virbac BioTec microchips fitted between 2009 and 2012.
Microchipping is a key way a pet can be identified and safely returned home if it gets lost.
Virbac are urging any dog owners who may have one of the potentially affected microchips to visit their local vet and get a new microchip. It's only the one type of microchip affected, there are many kinds, and Virbac are covering the costs of the new microchip.
Cat owners should also be checking their pet's microchip.
Hamilton City Council Animal Education and Control Manager Susan Stanford says they're doing what they can to let potentially-affected dog owners know.