Maybe ask them if you can volunteer or work for a local shelter or rescue group. You could also try fostering a dog, where you take care of a shelter dog while it is waiting for an approved person to adopt it. Some foster dogs may need daily medical care if the dog has been injured. All foster dogs will need regular training and socialization so they are well-behaved when they goes to their forever homes. Some foster dogs are young puppies that aren't quite old enough to be adopted out. And some foster dogs never get adopted and may spend the rest of their lives with their foster family. You could offer to take care of a friend's or neighbor's dog(s) when they go on vacation..