Dog collar for a walk in summer.?

In the US, just about everywhere has what we call "leash laws", which mean that a dog is required to be on a leash in public. Some places have breed-specific laws targeting bully-breeds that specify what type of leash, and what sort of collar must be used. I think that in most cases, smaller dogs can get away with a sliding collar/leash combo. But you are best off having a secure buckle-on collar that they wear all the time so that your dog always has ID tags on them. Then a leash can be snapped to that, or you can use a choke-chain if you want.