Most probiotic labels say nothing about age -- they're written for "adult dogs" in the generic sense and leave puppies unaddressed either way. These three products are different: each one's manufacturer explicitly says the product is fine for puppies, either in the dosing instructions or in on-page marketing copy, rather than us inferring it from a lack of a warning. That's a real, checkable claim, not a recommendation from us -- a product with no puppy statement at all isn't necessarily unsafe for puppies, it's just silent, which is a different thing from an explicit yes. Always check with your vet before starting any supplement in a puppy under a year old.
The manufacturer's own label or product page explicitly states the product is appropriate for puppies, rather than being silent on age or only implying it.