Ideally, dogs should be taken to council-designated areas where they can be safely let off the leash to run free. It is important to use these specifically designated areas not only to ensure their own safety (preventing the risk of being hit by a car) but also the safety of farm livestock and wildlife which can be threatened by a dog let loose in their habitat.
The RSPCA recommends that you do not purchase a dog from markets or places where large numbers of dogs are kept for sale. Dogs sold from these establishments are very rarely examined by a veterinarian, and therefore may not be entirely healthy. Never purchase a puppy that looks unwell and if you are concerned about the welfare of the animal, contact the RSPCA Inspectorate.
Puppy Roundworms can infect humans. To prevent this infection, puppies should be wormed regularly throughout their first year of life, and owners should be thorough with their own personal hygiene after having interacted with the dog. Tapeworms, Hookworms, and Whipworms can also infect dogs, and your veterinary surgeon can advise when to worm the dog.