Used with Dogtra 1900S. It fits the device, is much easier to put on and take off the dog than the old collar and since it was replaced and adjusted to the correct pressure I have never had - the collar fails to stimulate the dog. With the original collar, I had to mark the correct position of the collar so there was enough pressure to maintain contact, but not too much so the dog wasn't uncomfortable. Several times he was still unable to stimulate due to the dogs thick coat, large tapered neck and need for longer teeth. (Medium Coated Malamute) I would also like to point out that this allows me to put the collar on noticeably looser and still maintain good e-collar stimulation than the standard collar, it's more expensive than most other collars but gives me peace of mind. it more than makes up for it.
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