Yes. The 365 is suitable for dogs of all ages, from puppies to seniors, and is made for daily use all year.
The dosage depends on your dog's weight, not age: 1 chew per 10 kg body weight per day, rounded up to the nearest 10 kg.
Puppies: the dosage follows your puppy's current weight. As your puppy grows, you can adjust the number of pouches in your plan in your account.
Is your dog ill, on medication or does it have a health condition? Please check with your vet first.