Use different color puppy collars* or paint their toenails.
*Talking about the band type - Example would be
http://www.pupcolors.com/You can google to find different ones.
Or you can use the real small real size collars - Example would be
http://www.collar-safe.com/ID-Collars.html
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CoonDawgs.com - A Site Designed for Coon Hunters
American Houndsmen - Vintage Hound Hunting
Coon Dog Cemetery - Key Underwood Coon Dog Memorial Graveyard
HuntingBassets.com - A site dedicated to hunting with Basset Hounds