Dog safety. Yes. These are our babies. Not a must have but I wanted the security for my dog so I bought the vest for her. Just FYI I bought the one pictured on Amazon for under $17, now the price is higher.
https://www.amazon.com/gp/product/B0081XIK4Q/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1