Dogs can eat anything lying around the house, whether or not they're used on the dogs themselves. This is just a clickbait story because anything with "Apple" attached gets hits.
Sure, it's not the best real time tracker but if you live in a city with lots of iPhones, the Find My network is accurate enough that if you lose your dog, you'll have a general idea of where they went off to.
I used it as peace of mind when I travelled, knowing that my dog was still at my friend's house instead of trying to escape and find her home. Best $29 I've ever spent on my dog.