The walk has been fine until you turn for home. Suddenly your dog jumps, catches your sleeve, and grabs the lead. It can look like wild play, but frustration, worry, and rising excitement can all show up this way. You need a plan that keeps your hands and your dog safe, not a tug-of-war with your jacket.
If teeth are breaking skin, your dog is hard to control, or you feel unsafe, end the walk as safely as you can and seek hands-on support from a qualified, reward-based behavior professional. A sudden change also calls for a veterinary check. Do not try to overpower a dog who is biting.
Look just before the jump
Does it happen when you stop to talk, pass another dog, turn away from the park, or walk for too long? Shorten the route and avoid the difficult stretch while you work out the pattern. If your dog tends to grab the lead after passing a trigger, turn away before they become worked up. Give them time and space to sniff in a calmer place.
For a dog who can still respond, a toy they like to carry or a few treats scattered on safe ground may shift their attention. Reward walking with you before the grabbing begins, not only after they have let go. Keep the lead secure, if your dog may bite through it, ask a professional about a safe backup setup. Do not use a chain lead or a muzzle simply to suppress lead biting without addressing the reason behind it.
At home, build an easy routine of walking beside you for a few steps, getting a reward, and taking a sniff break. Then practice on short, low-pressure walks. As the pattern gets clearer, you can make the walk harder a little at a time. A shorter walk with a relaxed ending is much better practice than repeating the same frantic finish every day. After keeping hands and clothing safe, the high-energy dog activity guide has more on calmer outlets for an active dog. Seek individual help if bites are hard or frequent.
Sources: Dogs Trust: Lead ragging. Dogs Trust: How to stop your dog jumping up at people.