Dogs don't have hands. Therefore, they use their mouths to pick up any and everything. Puppies, like children, are new to the world and want to feel and taste of everything. They are a cute pain in the butt. That's why I don't have a dog. I've been there and have that T-shirt. I love them and help support them, but I don't want to have another one.
Decades before the movie "The Horse Whisperer," my dad was a horse whisperer. He was magic with horses. He had an old merchant pal that provided him cheap chewing tobacco. Dad never took a chew, but all of his horses and dogs were wormed with chewing tobacco. I have no proof that it worked, but it seems everything else the old man told me work out well.
If you keep bait type poisons for rats, mice, gophers, snails and whatever, keep them in a dog proof setting. Other than that, just remember the puppy is experimenting with life. Did you ever eat a bug?