Instructions
Know that in general, it's not best to choose two females. It can work out, but it's best to have one male and one female, or two males. Two females can be temperamental and have territorial battles.
Assess the personality of your current dog. If your dog is sociable and generally welcoming and playful to other dogs, he or she is likely well-prepared to share its home with a new friend. Dogs who are aggressive and unfriendly to other dogs may not react well to a new dog or puppy, creating a bad situation for you, the dog and the new little one. It's hard enough for a puppy to adjust to life with humans, let alone adding in the intimidation from another canine.
Try not to get two puppies. This doubles the work load for you, and can be difficult to give each the proper attention necessary for socialization and development. It's also likely that the puppies, especially from the same litter, will bond with each other more than with you.
Neuter at least one of your dogs if you have two males. This way, when each is fighting for dominance, there will be less of an issue when one is neutered. Also, neuter or spay one of your dogs if you're getting both a male and female.
Select a comparable breed. If you have an energetic dog, you'll want to get another type with as much energy, so that the two can play and keep up. Likewise, if you have an older, or otherwise laid-back breed, you don't want to overwhelm them with a crazy puppy that's bouncing off the walls. You'll want to choose another type of dog that has a similar disposition.
Understand your reasons for wanting a second dog, making sure you're doing it for the right reasons. If you're gone during the day and want a companion for your dog, it's reasonable to think that dogs can keep each other company. It could be a great solution. However, if you have a badly behaved dog and are hoping that a new set of whiskers will change that behavior, think again. In most cases, the new pup will adopt the existing dog's behavior and tendencies.
Introduce your dog to the dog or puppy you're considering bringing into your home. It may help if someone outside your family has hold of the new little one. It also helps to introduce the two on neutral ground where neither feels territorial. See how the dogs respond to each other before making a final decision.
How to Choose a Second Family Dog
For pet lovers, adding other set of paws to the family can be exciting. It can also be a serious decision, as you want to ensure you have the time and space for an additional pet, and you want to make sure you choose a breed that compliments your existing dog's personality. Make your family merrier with one more when choosing a second family dog.