Hi, A friend used to breed field trial beagles and when these dogs are running the bunny in trial they wear ID collars. These look like the old style ID bracelets with an engraved plate and the flat link chain are fastened tightly around the beagles neck to avoid getting tangled in the brush. They are also painted with numbers on their flank for the judges and if some of the hot running beagles would overrun the track and get lost those would wear tracking collars.
My local vet has a sign for embroidered flat collars whereby you have your surname and phone number on the collar and this can be worn without risk of tags getting caught. I've also rescued hunting dogs that have worn flat leather collars with an engraved brass plate, makes for easy return. There are lots of choices out there and as Anne says you choose what works for you. Take into account whether your dog lives with another, do they play and chew around each other's necks, are they escape artists, do you have good fencing and locked gates. Basic rule is never leave an unattended dog with a choke or martingale collar on and never crate a dog with these types of collars on. Flat or rolled buckled collars are best for daily wear providing they fit fairly snugly, loose fitting collars have the potential for getting caught. Rose T.