The function of various collars

From the perspective of the owner, buying a collar may feel like it was specially purchased for a cute dog, and that the good-looking dog should look great to wear. If you are satisfied with it, you have not considered the dog's feelings.
Dogs above medium size will have varying neck thickness as they age. If we only choose from the appearance, if we keep wearing an inappropriate collar, it will make our beloved dog feel pressure due to the sense of oppression, and it will also affect our education of the dog.