When picking out a leash for your big dog, there are a few factors to consider. First, you'll want to decide on the type of leash you'll be using. There are two main types of leashes: retractable and non-retractable. Retractable leashes are usually better for small dogs since they can be easily pulled back into the handler's pocket or purse.

Non-retractable leashes are better for bigger dogs since they can be tightened to create a tighter grip, making them less likely to pull away from their handler. Another factor to consider is the size of your dog. Different leashes are designed for different-sized dogs.

Most retractable leashes come in three sizes: small, medium, and large. Non-retractable leashes come in two sizes: large and extra-large. If you have a dog that is between sizes, it is best to buy the largest leash available. You can check out https://ergodog.com/collections/all to find a wide range of big dog leashes. 

You'll need to decide on the type of clip your leash will have. Most leashes have either a loop or a D-ring attachment. A loop attachment is easiest to use but can be difficult to remove if your dog gets tangled in it. A D-ring is best for attaching a leash to a carabiner or other type of clip. Deciding which kind of clip you want will be your decision, so if you are not sure what you prefer, take the time to decide now.