There's also another reason experts caution against them: their tracking limitations.

A woman whose dog died in minutes as it was strangled by its collar has called on pet companies to display warning signs and said she will never put a collar on a pet again. Jenny, 70, from Cambridge, ...

This collar uses real-time GPS to keep tabs on your pooch, sending you smartphone notifications if your dog ever strays from your yard. It also works as a fitness tracker, counting your dogs steps and ...