As mentioned above, dogs do what gets reinforced. If your Great Dane pulls on the leash and gets what he wants (to sniff that bush, to greet that person, to chase the cat) then he will continue to do it and it will get worse. Instead, if you feel your dog start to pull you in one direction, turn and walk the opposite way. Once he is walking next to you nicely, you can turn back and go the way he wanted to. This teaches your Great Dane that if he wants to go somewhere, he has to keep that leash loose. This works best when they are still a puppy and not stronger than you, so be sure to train early!
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Body Harnesses. There are many kinds of body harnesses. Front-attachment harnesses offer great control but are best used with two points of attachment (clip on back of harness with one end of your leash and the front of harness with the other end). For brands, I like the Balance Harness, XtraDog, and the fleece-lined PerfectFit from the UK. Learn how to use the so that you can use a regular harness instead of a no-pull harness.
The 2017 Best Dog Harnesses Review | Whole Dog Journal
These are the second set of Wacky Walkers that I have purchased for our two large greyhounds. We walk so much that we wore out the first set. These leashes are literally the BEST for walking large dogs. The leashes absorb the energy of pulls and leaps (towards cats and rabbits!), so that your arms/shoulders/torso don't get pulled with your dog. I highly, highly recommend Wacky Walkers!
Leash Training Your Dog Using a No-Pull Harness - Pet Expertise
No-pull products can be a great investment if you’re struggling with an over-eager, unwieldy puppy or dog. There are actually several types of no-pull dog products, including harnesses, leashes, and collars. Some are ideal for large dogs, while others work best for puppies and toy breeds.There are several reasons you might be looking for the best leash for dogs that pull. I mean, everyone knows that dogs are incredibly excitable creatures, right? It’s part of what makes them so loveable. Whether they smell something tasty, see something interesting, or are feeling playful, dogs are always hopping and jumping around.