This is a specific conversation about Dog collars — fit, material and safety — ask about yours and get one honest answer for your exact situation.
inparticular.ai
Greyhounds are one of the breeds where collar choice genuinely matters — their necks are wider than their heads, which means a standard flat collar can slip right off, and that's a real safety risk. A martingale is almost always the right answer for sighthounds, and getting the fit right for each dog individually is important even when they're the same breed. To point you to the right option: what are the neck measurements for both dogs, and do you have a preference for a fabric or a chain-loop martingale? Also, are these for everyday wear, or mostly for walks and lead attachment?
The 3-year-old has a neck of about 30cm and the 5-year-old is closer to 35cm. Both are quite lean. I'd prefer fabric — no chain. These will be for walking and general wear, nothing to do with training.
inparticular.ai
Perfect — those are classic Greyhound proportions and fabric martingales are absolutely the right call for everyday wear. They're quieter, gentler on the coat, and more comfortable for a dog wearing a collar most of the day. One thing worth flagging with lean Greyhounds specifically: you want the collar to tighten just enough to prevent slipping but never so much that it pinches — so adjustability across a decent range matters. Can I ask whether either dog has a particularly sensitive neck or any history of skin issues? Some Greyhounds do better with wider collars to spread the pressure.
No skin issues that I know of. The younger one is quite wriggly on the lead though — tends to back out of things.
inparticular.ai
That's exactly the scenario martingales are designed for — a dog that backs up and pulls their head out. The limited tightening action means it firms up just enough to stay secure without choking. For both your dogs, I'd recommend the Hound About Town Martingale Collar — it's made specifically for sighthound proportions, comes in a range of widths and sizes including options that will suit both your 30cm and 35cm neck dogs, and uses a soft polyester webbing that holds up well to daily wear. The adjustment range on each size is generous enough that you won't be stuck right at the edge of the sizing. It's well-regarded in the Greyhound rescue community, which is usually a reliable signal for quality.
That sounds good. Should I get the same width for both, or size the width differently too?
inparticular.ai
For two dogs of similar build with no specific needs, the same width is fine — the standard 3.8cm (1.5 inch) wide option is a good all-rounder for adult Greyhounds. It spreads pressure well without being bulky. Just make sure you measure each dog's neck on the day the collar arrives and adjust them independently — even a 5cm difference in neck size means the fit will feel quite different between the two, and you want about two fingers of slack when the martingale is at its loosest.
Great, that all makes sense. I'll order two in different sizes. Thanks.
inparticular.ai
You're all set — two different sizes, same model, and adjust each one to your individual dog before the first walk. The two-finger rule at the open position and a snug-but-not-tight close when the lead is taut. Greyhounds are escape artists but a well-fitted martingale closes that gap completely. Enjoy the walks with both of them.
Your situation is probably different. Get a specific answer for yours.