Most of the Time Dogs are loyal companions that bring Joy and Happiness to our lives. Dogs can provide us with real unconditional love and become an essential part of our families.

However – Some Pet owners often have concerns about introducing a New Puppy to an Older Dog. One of the most common questions is: Will an older dog hurt or even kill a new puppy?

In this blog post, I will explore this question in detail and provide you as a “Pet or New Puppy Owner” with some useful tips on how to introduce a new puppy to an older dog.

I. Factors to Consider

Before we will delve into the question of whether an older dog harm or fatally injure a new puppy?

It is essential for you to understand that there are several factors to consider. These factors can help you determine how an older dog will behave around a new puppy

1) Age and Breed of the Dogs

The Age and the breed of your old Dog are two critical factors that can impact the behavior a lot. If your older dog is in their senior years, he may not have the energy level anymore to keep up with a playful puppy.

different dog Breeds

Similarly – if your older dog is a smaller breed, he may be intimidated by a larger, more energetic puppy.

On the other hand, if the older dog is a very large breed, he likely may be too rough with the newly introduced puppy during playtime.

2) Temperament and Behavior of the Dogs

If your older dog has a calm and relaxed demeanor- he most likely will accept a new puppy.

However, if the older dog is already known to be aggressive or territorial, he may not be as welcoming to a new addition to the family. In Rare Cases Older Dog have Hurt or Even Killed a Puppy

3) History and Experience of the Dogs

The history and experience of dogs can also play a significant role in how they behave around each other.

If your older dog at some point had a previous negative experiences with other dogs, he may be more likely to display aggressive behavior towards a new puppy.

Similarly, if the puppy has had a limited socialization with other dogs, they may not understand how to interact appropriately with your older dog!

5) Size and Strength of the Dogs

Size and strength are two other crucial factors to consider. If your older dog is significantly larger and stronger than the puppy- he can accidentally harm the new puppy during playtime.

Similarly, if the puppy is very small and fragile- this puppy may not be able to defend themselves against an overly rough older dog.

Big old dog with tiny puppy

6) Training and Socialization of the Dogs

Proper training and socialization are crucial factors for a safe and smooth coexistence between a puppy and an older dog!

Training can help both dogs to understand how to interact appropriately with each other! A proper Dog training will teach them basic commands such as “sit” and “stay.” Additionally, socialization will help new puppies learn how to communicate with other dogs and better understand how to behave in various situations.

Training and Socialization wil help preventing misunderstandings or aggressive behavior towards an older dog. For older dogs, socialization can also help them become accustomed to interacting with younger dogs, including puppies.

A dog that has been adequately trained and socialized – is more likely to be calm, confident, and accepting of a new puppy in the household.


Considering all the factors that impact the behavior of older dogs, pet owners can ensure a peaceful and harmonious introduction of a new puppy to an older dog.

It is essential to take precautions and use strategies such as proper training and socialization to make it safe to introduce a puppy to an older dog without the risk of injury or death.

II. Risks of Introducing a Puppy to an Older Dog

Introducing a new puppy to an older dog can come with risks. It is essential to be aware of these risks before bringing a new puppy home.

Older dog playing with puppy

1) Aggression and Territorial Behavior

Surely one of the most-significant risks of introducing a puppy to an older dog is the potential for aggression and territorial-behavior.

Signs of Aggression and Territorial Behavior

  • Growling, snarling, or showing teeth when approached by another dog or person
  • Lunging or charging at other dogs or people
  • Barking excessively at perceived threats, such as visitors or other dogs passing by
  • Marking territory by urinating or defecating in specific areas of the house or yard
  • Guarding food, toys, or other possessions from other dogs or people
  • Chasing or attacking smaller animals, such as cats, squirrels or Older Territorial Dogs may even attack and kill a Puppy

If your older dog feels threatened by the new puppy, they may lash out in aggression. Such a territorial behavior can lead to injuries to both the puppy and the older dog, and in severe cases, it can result in the death of the puppy.

What can you do about territorial aggression in dogs?

Teach your dog to retreat to a mat, crate, or designated sleeping area on command, where they should remain until you release them. If your dog exhibits extreme aggression towards visitors, you can also teach them to relax in another room.

Can territorial behavior be unlearned?

In reality – territorial behavior cannot be unlearned. The good news is that you can learn to manage it effectively and minimize the chances of an older dog being aggressive towards a new puppy and causing harm?

2) Injury or Harm During Playtime

Many people are unaware of the frequency of dog play injuries, which can range from minor, such as a small cut on a paw that heals quickly, to severe, such as torn ligaments and hip injuries that may require surgery and cause long-term disabilities.

During playtime, small dogs are vulnerable to injury as they can resemble prey to larger dogs. Prey-drive, a dog’s instinctual urge to chase and capture prey, can cause larger dogs to mistake smaller dogs for something to be chased. This is particularly true in play areas where dogs become excited and run around.

Reducing the risk of a new puppy getting injured during playtime with a bigger older dog is crucial to ensure their safety and well-being. Here are some tips to help minimize the risk:

  1. Supervise playtime: Always supervise playtime between the older dog and the new puppy to prevent rough-play or aggression that could lead to injuries.
  2. Separate playtime: Initially, it may be necessary to keep the older dog and the puppy separated during playtime to prevent accidents. Gradually, you can introduce supervised play sessions in short intervals and increase the duration as they become more comfortable with each other.
  3. Use a barrier: If your older dog tends to be too rough during playtime – consider using a barrier to separate them. A simple baby gate or playpen can be used to keep the dogs separated – while allowing them to see and smell each other.
  4. Provide adequate space: Ensure that the play area is large enough for both dogs to move around comfortably without feeling cramped; this will reduce the risk of accidents caused by collisions or bumping into each other.

Pet owners can reduce the risk of a new puppy getting injured or even killed during playtime with a bigger older dog, and promote a peaceful and harmonious coexistence between the two dogs.

3) Stress and Anxiety for Both Dogs

Finally, introducing a new puppy to an older dog can cause stress and anxiety for both dogs.

The older dog may feel threatened by the new puppy, leading to feelings of stress and anxiety.

Similarly, the new puppy may feel anxious and overwhelmed in a new environment with a new family and a new furry companion.


Introducing a new puppy can be stressful for an older dog. To reduce irritation and ensure their well-being, it’s important to give the older dog frequent breaks from the new arrival. This can be done by taking the older dog out for walks or closing off parts of the house.

Additionally, providing a crate for the new puppy can help reduce stress for all dogs involved. This also reduces the risk of an older dog attacking or killing a young puppy!

III. Precautions and Strategies for Introducing a Puppy to an Older Dog

While there are risks associated with introducing a new puppy to an older dog, there are several precautions and strategies pet owners can take to ensure a smooth transition.

1) Gradual Introduction and Supervision

The first and most crucial step is to introduce the new puppy to the older dog gradually. Start by allowing them to sniff each other from a distance and gradually move closer together.

It is essential to supervise the interactions between the two dogs closely.

  • Start on neutral ground: Introduce your new puppy to your senior dog in a neutral location, such as a garden or during a walk. Avoid high-traffic areas or places with other dogs.
  • Keep them on a leash: Keep both dogs on a loose leash with a calm person at the other end. Allow them to walk at a distance and get used to each other’s scent and presence.
  • Observe their behavior: Watch their body language for signs of aggression, such as growling, aggressive staring, or fur standing on end. If you see this type of behavior, redirect their attention elsewhere.
  • Allow them to socialize: Once the dogs are comfortable with each other, you can shorten the distance between them. Observe their body language, but interfere as little as possible.
  • Move slowly: If they are comfortable together, you can bring them home. It’s important to have a way to separate them, such as specific rooms or baby gates. Your puppy may annoy your older dog, so having a way to give them space will relieve stress.

2) Positive Reinforcement and Training

Positive reinforcement” is a training technique for dogs. Here, the pups and your older Dog are rewarded for desirable behavior with something positive.

Dogs learn that certain behavior has consequences and can link them to something pleasant through the reward. For most dog trainers, food is the best reward . This is because all dogs like to eat, it is efficient, can be delivered quickly.

Play is also used as a reward in dog training. For example, a game of tug or ball.


Positive Reinforcement and Training can also be helpful in introducing a new puppy to an older dog. Reward both dogs for calm and positive behavior towards each other, such as sitting calmly in each other’s presence.

Positive Reinforcement Training can reduce the risk that an Aging Dog will Harm or Fatally Injure a New Puppy!

3) Separation and Management

Separation management can be an important tool when introducing a new puppy to an older dog. It can help prevent the older dog from becoming overwhelmed or aggressive towards the new puppy, and also help the puppy feel safe and secure in their new environment.

One way to use separation management during the introduction process is to give each dog their own space to retreat to when needed; this could include providing the older dog with a separate room or crate, and giving the puppy their own designated area with toys and a bed.

This way, if either dog becomes overwhelmed or needs a break, they have a safe space to go to.


Separate the Dogs when unattended: When you cannot closely monitor your dogs’ interactions, keep them apart. Crating your puppy can prevent accidents with your older dog and reduce destructive chewing and house soiling.

Establish boundaries: To avoid territorial behavior, it’s important to establish boundaries with your dogs. Each dog should have its own toys and belongings.

Focus on your senior dog to relieve their anxiety, greeting them first, feeding them first, and leashing them first when going out without disrupting their routine.

IV. Professional Help and Advice

Finally, do not hesitate to seek professional help for a for a smooth and successful integration of a new puppy with an older dog if necessary.

A professional dog trainer or behaviorist can help assess the behavior of both dogs and provide guidance that older dogs and puppies live together safely!

V. Conclusion

For a Safe and smooth coexistence between a puppy and an older dog – it is essential to consider several factors, such as the age, breed, temperament, behavior, history, and experience of the dogs.

While there are risks associated with introducing a new puppy to an older dog, taking precautions and using strategies such as gradual introduction, positive reinforcement and training, separation and management, and seeking professional help and advice can help ensure a smooth transition.

Ultimately, whether an older dog will hurt or even kill a puppy depends on the specific dogs and circumstances! With careful planning and preparation, a successful integration of a new puppy into a household with an older dog won’t be to difficult


  • Arhant, C., Bubna-Littitz, H., Bartels, A., Futschik, A., & Troxler, J. (2010). Behaviour of smaller and larger dogs: effects of training methods, inconsistency of owner behaviour and level of engagement in activities with the dog. Applied Animal Behaviour Science, 123(3-4), 131-142.
  • Overall, K. L., Dunham, A. E., & Frank, D. (2001). Frequency of nonspecific clinical signs in dogs with separation anxiety, thunderstorm phobia, and noise phobia, alone or in combination. Journal of the American Veterinary Medical Association, 219(4), 467-473. Link
  • Saito, M., & Shinozuka, K. (2013). Effect of dog-walking on autonomic nervous activity in senior citizens. Medical Journal of Australia, 199(10 Suppl), S71.
  • Todd, Z. E., & Mills, D. S. (2018). A comparison of the sensory and cognitive abilities of humans and dogs. Journal of Veterinary Behavior, 25, 105-115. Link
Categories: BlogsDogs


Marco Heitner

Hello, my Name is Marco. My family has had pets since I can remember. Today we have a large aquarium and, since recently, a four-month old Labrador. I am the owner of this website, and it is my great pleasure to provide helpful knowledge about pets. Our team is constantly working hard to publish well-researched reports here.


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