Having a dog is a lot of responsibility, not only does that animal depend on you completely to care for them and keep them safe. But, also animals can do unexpected things and It is your responsibility to ensure the safety of people around your dog as well. So many times I have seen complete strangers walk up to a dog and start petting them with no idea if it's safe or not, or an annoyance to the dog or the owner for that matter. Some dogs will let you know not to come near them with a sneer or growl but others might not give any indication and jump or bite with out warning.