Many breeders recommend that your first dog be at least one-to-two-years old before you add a second to the family. If you have an old dog, they may not be physically able to play with or tolerate a pup.
Feed your new dog in a different room, so there's no stress over food. Keep up your regular walking and playtime schedule, making sure both dogs get plenty of love and attention. Keep the dogs' interactions closely supervised for the first two weeks, until both dogs are fully accustomed to each other.
Many people do not give two dogs time to adequately adjust to one another before deciding that having two dogs will simply not work. It can take up to one month for an old dog and new dog to really settle in and accept each other's position in the pack.
The short answer is: no. While it's usually harder to train an older dog than a puppy, it's never too late to train a dog — you just have to be willing to put in the time, patience and determination required to create boundaries, establish new habits and eliminate destructive behaviors.
Dogs are social animals and usually happier around other dogs, but a second dog will never be a substitute for inattentive, absent or too busy owners.
Dogs that exhibit relaxed, playful body language during playtime at the dog park are more likely to get along with a new furry friend at home. And, if your pup is sad to leave their friends at the park, it's a good sign they'll benefit from a fur sibling.
Many people are hesitant to adopt a second dog because they assume it will be twice the work and twice the money. But the truth is, owning two dogs doesn't have to be more work – in fact, it can often be easier. And as for the cost, it will cost more money than one but not twice the amount.
According to several behavioral measures, Coren says dogs' mental abilities are close to a human child age 2 to 2.5 years. The intelligence of various types of dogs does differ and the dog's breed determines some of these differences, Coren says.
Approximately 35% of owners and trainers voted 8-9 months as the toughest age citing new challenging behaviors associated with their puppy's now larger size such as pulling on the leash or counter-surfing.
From 1 to 2 Years
Your dog has graduated from puppyhood. As your puppy nears age one (up to two years for a large breed), they're beginning to look and act more mature. They will probably still be playful, but now they've learned the ropes and are much better at following the rules.
Introduce valuable items like toys slowly
As you see that they're getting along, introduce toys that your older dog doesn't really care about and that are safe for the puppy. Or bring in new toys as long as the older dog doesn't guard them. Have one handler play with the puppy and another with the adult dog.
Introduce on neutral territory.
Each dog should be walked separately on a leash, and each walker should have a bag of high-value treats or food broken into small pieces. At first, walk the dogs at a distance where they can see each other but are not too provoked by each other's presence.
Most dogs will welcome a new sibling, but it is not always smooth sailing. The furry family member you have now will face many changes when a new dog enters the picture and may feel a bit displaced. He may not like sharing his territory, toys, food, resting places, or humans.
Second Dog Syndrome
As humans, we are bound to forget all of the time and effort it takes to raise a puppy right. All too often, a second dog joins the household and the expectation is that they will behave as the existing dog in the home does, so they are often given the same freedom right off the bat.
But don't worry – it's not. You can start training any time, with any dog – whether this is when you bring your puppy home at 8 weeks old or when your dog is already 12 years and needs a new skill.
When jealousy occurs, it is important to deal with your dog's emotions, properly. Introduce your dog and the new puppy on neutral grounds first. This will help maintain the idea that you are their pack leader and you are willing to play with both dogs. They can use this neutral territory to explore each other.
As dogs get older, their social circles shrink. They enter sexual maturity around 7-9 months and social maturity at 1-3 years. With that maturity and wisdom, they may be less interested in playing or they might play more roughly when excited. That rough play may lead to aggressive habits.
Around the 4-5 month age pups get quite naughty (cheeky), they have worked you out by now and know how to get around you and they begin to ignore your instructions. At first it can seem funny but it soon wears thin.
6 Months - 1 Year Old
Your puppy should know all of their basic commands and have a solid foundation of potty training, crate training, and socialization. From this point on, you will continue to work with your puppy to reinforce what they have already learned!
Adult Dogs
Once your dog is between one and five years old, they'll start sleeping a little less than when they were a puppy. Dr. Evans advises that adult dogs get eight to 14 hours of sleep per day to be their happiest, healthiest selves.
Young Adult (12mo - 2-3 yrs)
Dogs reach physical maturity during this phase but they are not socially mature and need continued guidance learning appropriate behavior. Small breeds will reach physical maturity about 12 months while large breeds will take between 2-3 years.
Dogs over 2 years old are adults. They are more mature and can give focus and attention for longer periods. Depending upon their breed and energy level, they tend to be able to harness their energy better than puppies. Senior dogs are dogs over the age of 8 years old.
What's the age of your current dog? Many breeders recommend that your first dog be at least one-to-two-years old before you add a second to the family.
Before settling on a breed, think about the gender of the dog. For the happiest dogs and the safest household, opposite sex dogs almost always do best together. Many same-sex combinations of dogs will fight, sometimes to the death. Those who work out a dominance order may not fare much better.