Hardware first, again
The same rule as leashes. A collar fails at the D-ring, the buckle or the stitching holding them, and almost never at the material.
The D-ring is where the leash pulls, every walk, for years. A stamped steel ring wears thin and eventually opens. An aluminum or cast V-ring - which is what Ruffwear uses - distributes that load much better.
The buckle. A side-release plastic buckle is convenient and is the weakest point on most collars; they crack in cold weather. A metal buckle on a leather collar is stronger and slower to use.
A separate ID ring is worth having so tags are not jingling on the same ring the leash clips to, where they wear against each other.
The collar types, and who each is for
Flat buckle collar. The default. Safe to leave on, simple, nothing to catch. For most dogs this is the right answer and the only one needed.
Martingale. A limited-slip design with a smaller control loop that tightens to a set point when the dog pulls back - and no further. It is the correct collar for sighthounds and any dog whose skull is narrower than its neck, because a flat collar will simply come off over the head. It must not be left on unsupervised.
Half-check. Similar principle with a chain section. Gives more feedback, mats long coats, and also should not be left on.
Harness. Not a collar, and outside this page - but worth saying that for a dog with a collapsing trachea or a flat face, a harness is a medical necessity rather than a preference.
Materials, briefly
Leather softens to the neck and then stays that way for a decade, and padding prevents the edge-cutting that plain leather causes. It is the wrong choice for a dog that swims, because repeated soaking stretches and then cracks it.
Webbing is cheap, strong and absorbs water and smell.
Biothane absorbs nothing and is the right material for wet and muddy dogs.
Woven reflective webbing, which Rogz uses, is genuinely better than printed reflective strips - printed reflectives wear off within a season and woven ones do not.
The warranty position
Ruffwear publishes a guarantee against defects in materials and craftsmanship and explicitly excludes chewing. On dog gear that is a notable exclusion and an entirely fair one - a collar chewed off by a crate-mate is not a manufacturing fault.
Nothing else on this page publishes terms we could verify, which is standard for the category. Buy on the hardware.
Fit, which is a safety issue
Two fingers flat under the collar. Tighter and it rubs; looser and the dog backs out of it, which is how dogs end up loose near roads.
Check it monthly on a growing dog and seasonally on an adult - a winter coat changes the fit more than people expect, and a collar fitted over a thick coat will be loose when the dog is clipped.