I just received my BYTE TAGS, so i can't say how it will work, and i believe this IDEA IS GENIUS! HOWEVER, having a large, clutzy dog and having had multiple large dogs in the past, I would STRONGLY recommend working with R&D to develop a stronger tag and stronger attachment ring. These are not going to last with a strong, active dog. The size of the pendant is perfect. The colors are cute, but not as vivid as the ads on their website. As a side note, I believe the weight and material may work ok for a small dog.
Edited to add, there are no written directions with pendants.