SportDOG SD-1225X / SD-1275 / SD-1825X Add-A-Dog Additional Collar / Extra Receiver SDR-AXNo risk to you. Your 100% Satisfaction is Guaranteed with our 30 Day "No Questions" Money Back Guarantee. Hassle-free returns & exchanges.  Original extra collar for the SportDOG SD 1225X, SD 1275E, SD 1825X, and SD 2525. Includes 3/4" green collar strap that fits up to a 23" neck, short and long contact points, charger and owners manual. Compatible with the Following Systems: Synchronizing a Replacement Collar Receiver to your Transmitter1. Turn off the Collar Receiver    How to Program the Collar for Two-Dog Operation with the SD-1825X 1. Program the Remote Transmitter to mode 1, 2, 5, 6, or 7 with the toggle in the grey up position, or any mode with the toggle in the orange down position. (Consult the SD-1825X Owners Manual for more information on Transmitter Modes.) 
3. Program the second Collar Receiver the same way using A through D above, but with the toggle switch to the orange/down position. How to Program the Collar for Three-Dog Operation with the SD-1825X 1. Program the Remote Transmitter to mode 3 or 4 in the toggle up position. (Consult the SD-1825X Owners Manual for more information on Transmitter Modes.) 2. Program the first Collar Receiver:
4. Program the second Collar Receiver using A through D above, but using the Lower Button in place of the Upper Button. 5. Program the third Collar Receiver using A through D above, but using the Side Button in place of the Lower Button. How to Program the Collar for Six-Dog Operation with the SD-1825X Repeat Steps 1-4 from "THREE-DOG OPERATION" above for dogs 1-3, then flip the toggle switch to the orange down position and repeat Steps 2-4 for dogs 4-6. (Consult the SD-1825X Owners Manual for more information on Transmitter Modes.)
Customer ReviewsReview Summary
4.7
3 Reviews
5
66.67% (2)
4
33.33% (1)
3
0% (0)
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100% Recommend this product (3 of 3 responses)
By Terry
North Carolina
Good as Usual but the Beeper is too quiet
November 7, 2025
This is as good as always, but I wanted to put it on an older dog whose hearing is fading--don't they all?--and she just doesn't hear it that well, I think. (She could be blowing me off but I don't think so.) I may switch her to one of the older ones I have which is definitely louder.
Cons
By Mike
Houston
Extra collar
July 8, 2025
The collar was just what I needed and hoped it would be. Came with a green strap and I asked for an orange one and it was included with my order. Very impressed N
Pros
Cons
By Tim M.
Panama City, Florida
SportDog Add-A-Collar SDR-AX
February 25, 2022
I purchased this add-a-collar to replace one other add-a-collar (SDR-AW) I purchased several years ago after it stopped working ( would charge but no any longer communicate with my 1225 hand held unit) to go with my original 1225 hand held unit which I also purchased several years ago (I run 3 upland dogs at a time). After I programmed the new SDR-AX collar to operate with my existing 1225 hand held unit the new collar as well as the original collar that came with my original 1225 unit as well as a second add-a-collar (SDR-AW) I had also purchased several years ago as well, all three (3) collar receivers operate perfectly with my original SportDog 1225 hand held unit. I am well pleased with the operation of the new the performance of my new SDR-AX add-a-collar. Now that I figured out it is the original add-a-collar that has the communication issue I wish I could find out how to get it repaired as well.Thank youTim McGuffin
SD-1225X/1275/1825X Add-A-Dog-Collar | ||||||||
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