Nylon webbing
Flat nylon is usually light, compact, and inexpensive. It comes in many widths, which makes it easier to scale for a puppy or small dog. It can absorb water, collect grit, and become uncomfortable if a narrow edge runs quickly through the hand.
Inspect the stitching near the clip and handle. Fraying, cuts, melted edges, or a damaged seam mean the leash should be retired.
Rope
Rope leashes often have a round profile and a substantial feel. Diameter, braid, core, and handle construction vary widely, so “rope” does not describe one level of strength or grip.
Wet rope may become heavy and can hold dirt. Any line can burn skin when it slides under force. Do not wrap rope around the hand or rely on thickness as proof that the clip is strong.
Coated webbing
Coated webbing is popular for muddy or wet walks because it can be wiped or rinsed. The coating can become slick in some hands, and cold weather may change flexibility. Check the edge, rivets, and coating for cracks or separation.
“Biothane” is also a brand term, while many products use other coated materials. Judge the actual construction rather than the label alone.
Compare the whole leash
Open and close the clip several times. Check that the gate seats fully and the swivel turns without visible damage. Look for strong stitching or correctly set rivets and a handle you can hold without bunching.
Choose length and mechanism with the leash types guide. For a puppy, also consider leash weight and scale.
Choose for real use
A washable nylon leash may suit ordinary dry walks. Coated webbing can be practical for mud and salt water. Rope may suit a handler who prefers a round, thicker grip. Try the leash with gloves, wet hands, and the dog’s actual equipment before trusting it in a difficult setting.
Replace any leash after a serious chew, cut, hardware deformation, or failed closure. Material preference cannot compensate for damaged equipment.
Run a simple handling check
Attach the leash to the dog’s normal walking equipment in a secure area. Walk, turn, gather slack, and hold the line with wet hands or the gloves you use in winter. Notice whether the material twists, slides, becomes bulky, or creates uncomfortable edges under ordinary tension.
Clean it according to the maker’s instructions and inspect it again after drying. Dirt can hide abrasion and corrosion. Keep a spare fixed leash available, especially when trying unfamiliar hardware or taking a line into mud, salt water, or freezing conditions.
Material matters less than what happens at the other end. If the leash is tight most of the walk, stopping the pulling comes before choosing a nicer line.