Petfon could track up to 3 pets at the same time,that means you could connect 1,2 or 3 trackers to one Petfon network. You would be able to bind all these 3 trackers with just 1 cellphone.
1 Cellphone==>1 Controller==>1,2 or 3 trackers.
Since you just have 2 pets, you could just purchase a standard unit(1 controller + 1 tracker) and an additional tracker.
Please kindly set order through the following link:https://www.petfon.com/collections/all