Martingale collars, aka Greyhound Collars, are simple and effective. Worn loose over the neck, the martingale snugs when tension is applied with the leash. The snugging is non-aversive but does not allow the collar to slip over the dog's neck.

Fido Finery™™ - Collars from traditional to trendy. With eleven patterns we have a style for everyone. - High-quality nylon webbing, with colorful jacquard ribbon overlay for functionality and flair. Collars come in the following sizes: Petite (5-8" in 1/2" width, e.g. dachshund, chihuaha); Small (8-12" and available in 1/2" and 3/4" widths, e.g., toy poodle, Jack Russell Terrier, beagle); Medium (10 - 16" and available in 3/4" and 1" widths, e.g. Springer Spaniel, Border Collie) Large (14 - 20" in a 1" width, e.g. Lab,Golden, GSD) and XL (18 - 28" and in a 1" width, e.g. Mastiff, Great Dane, Newfoundland).