Puppies, as cute and sweet as they are, often can be very mischievous little creatures. If your pup has a frustrating habit of attempting to chew on the leash as you take him on walks, it may be a sign of anything from being excited to boredom, plain and simple.
One of the most charming aspects of puppies is their sense of excitement and wonderment about the world. The mere sight of another dog doing something interesting may compel a little pup to get so excited that he tugs on his leash and then chews on it. For example, you may be taking your puppy on a typical stroll through the park, only to pass another doggie enjoying a session of fetch. If your puppy wants in on some of the entertainment, the leash-biting may just start up.
If you're leash training your puppy and he starts to chew the leash out of nowhere, it may be an indication that he's bored of the whole thing. Nothing more, nothing less. The boredom chewing may be a signal to you that you need to change things up. Consider walking your dog in a different, all-new environment or perhaps even speeding your pace up a little. Voila, unfamiliar scents and scenery.
The puppy stage is a time of curious exploration, and a lot of that exploration is conducted using the mouth. If your sweet pup has taken to "mouthing" his leash on your regular walks, it's probably time to invest in a few chewy toys and bones for him if you haven't already. The more interesting items your pet has to chew on, the less likely he may be to put his mouth on something inappropriate, such as his leash.
If you're trying to take your pet on a normal and energetic walk and he keeps interrupting your progress by persistently biting on the leash, it may be the little one's attempt at getting your attention -- aww. If you suspect that this is the case, focus on providing your cutie with more love and attention at other times, whether you pet him more often or participate in more interactive games at home -- think hide-and-seek, fetch or tug-of-war.