A dog may bark at people or other dogs if they haven’t been socialized well enough. A dog that has had many positive experiences with all ages and types of people, including people on bikes, in wheelchairs, children, etc., is less likely to bark at them. Letting your dog meet the mailman and the UPS driver, for example, and asking them to give your dog a treat can help. Exercise can also play a role, as a tired dog is more likely to rest when you’re not at home. Make sure your dog has an adequate amount of physical and mental exercise before you leave in the morning. You can also try an indoor dog treadmill during colder months. If possible, have a dog walker come to walk your dog mid-day. Additionally, teaching the “quiet” command can be helpful, use a calm, firm voice to tell your dog to be “quiet” and positively reinforce correct behavior with treats and affection. Managing surroundings can also help, such as closing the blinds before you leave the house, to remove your dog’s opportunity to see things that will tempt them to bark. Don’t respond to barking dogs, wait until your dog is quiet to give them what they want.