A:AnswerWhen my tag fell off, it told me it was 4500 miles away from me when I was in Austria and it was in Chicago. It works as long as it's near an iPhone.
A:AnswerI didn't think these were a bluetooth device. Does the iPhone at home detect your dog's location properly? Can you test it by taking the tag a block from home or so and trying to locate it *from your house* using that iPhone? These should work without any type of service or connection - that's kinda the point. Why are you using a separate device as a 'middle-man'? You should be able to add them to your Find My app on any Apple device you're logged into with your Apple ID (perhaps not older models, though).