No, you can not add an additional collar to the 1 dog unit. You will want to get the (MODEL 2502) 2 collar unit, item number 38-868-843-00
answered 3 years, 6 months ago
im not sure how many collars you can add but i know you can buy and add to it but i know we got like five or six collars per system
answered 3 years, 9 months ago
No, I called and asked Dogtra the same thing. If you want the option to add collars to an existing system, I would suggest going with Trittonics.
answered 4 years, 5 months ago