As mentioned above, puppies respond well to positive-reinforcement based training. It is important to acknowledge that dogs cannot possibly know which behaviours are right and which are wrong - it will be up to you to teach them. Take the time to show your puppy what you want them to do and reward them with a treat, praise, or a game each time they do the right thing.
During summer, a flea control shampoo and a flea rinse should be used. However, this should by no means substitute a proper monthly flea control regime such as Spot-On, Revolution or Frontline. Consult your vet or chat with the RSPCA's friendly vet nurse team for free advice on flea control for your pet. It's important to remember, after the application of flea treatment be sure to wait 24-48 hours before bathing your dog.