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The first and most obvious suggestion is to keep your dog's tags on at all times, including your name, address, and telephone number. If you don't have something like this, put it at the top of your list of things to buy. You can get some really nice collars with tags that you and your Puggle will love.
Second, we here at AllAboutPuggles recommend buying a collar that is very bright: neon colors are best. My dog wears a neon orange collar, and as ridiculous as it may sound, it's something you get used to. The neon orange really suits her at this point, and you can see her from a mile away. This protects her from being hit by a car, as it is highly visible even at dusk, and it reflects a car's headlights at night.
And lastly, you may want to look into a microchip for your Puggle. The microchip allows your dog to be identified for life, and cannot be altered or removed. It is injected deep under the skin of your dog, is completely painless, and is so small that it can be inserted by hypodermic needle. My dog has a micropchip, and I highly recommend them, as your dog can be easily and definitively identified for LIFE. Tags can be removed by a thief, but you will always have a connection to your dog through a pet microchip.