Get

In Your Inbox

Dogster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Puppy Mill Dog Behavior Problems & Vet-Approved Solutions

puppy mill cage

Getting a puppy should be an enjoyable experience. Pets can bring so much joy that it seems counterintuitive to consider behavior problems and the possible relinquishment of a pup. Sadly, it can occur with pets obtained from so-called puppy mills. The term describes dealers who mass-breed and sell canines for profit. Problems with puppy mills include crowded conditions, cramped living quarters, inadequate health care and prevention, lack of enrichment, and high animal turnover. This means that mothers bear as many litters as possible and puppies are often removed from their mothers before 8 weeks of age.

The issue rests with the animals’ development and the conditions they often endure in such places. Research has shown that early separation from a pup’s mother increases the risk of health and behavioral issues.1 Puppy farm dogs, especially those leaving as adults, show a higher incidence of fearful, compulsive, and repetitive behavior.

divider dog paws 3 oct 2024

The 6 Common Puppy Mill Dog Behavior Problems

1. Fears and Phobias

The socialization period in dogs is from 3 to 14 weeks, this is a time to introduce the pups to new experiences in a controlled and safe way. However, adverse experiences can have lifelong consequences. If a puppy isn’t handled by humans, or worse treated poorly, they may become scared. The lack of exposure can also translate to other areas of everyday life. For example, a puppy mill dog may have never been exposed to a veterinary clinic, traffic, or a diverse range of people, leading them to develop phobias. One study showed that fears occur in pet dogs more often when they have less activity and training, so you can see how this would apply to the extreme circumstances of puppy farming.2

  • What to Do:

While time-consuming, counterconditioning and desensitization may reduce your pet’s fearfulness. You will first need to earn your dog’s trust, with time, patience, and positive reinforcement. Exposure to new situations and people should happen gradually and be paired with plenty of positive reinforcement to build your dog’s confidence. Never force your pet into situations that are stressful for them, but rather let them progress at their own pace. Since these fears and phobias can be extreme we recommend working with professionals. Veterinarians can prescribe medication or supplements to ease anxiety, while behaviorists can show you how to deal with fears.

Sad puppy in cage waiting for adoption
Image Credit: malajka, Shutterstock

2. Lack of Bite Inhibition

Remember that the puppy’s mother and litter teach them important social skills. One of these skills is bite inhibition. Basically, when a puppy bites too hard, their mother will walk away, while litter mates will yelp. This provides important feedback which lets the puppy know how hard they can bite in friendly social interactions. These lessons are usually completed by loving owners of the puppy in the first few months. So if puppy mill dogs have been removed from their family too early, and placed in a cage with minimal interactions, bite inhibition was never learned.

  • What to Do:

Make sure everyone who interacts with the dog understands how to do so respectfully, and never put a dog in a situation where they will bite. Understand that your dog lacks social skills and other dogs will probably react poorly to them, even if they mean no harm. Talk to your veterinarian about the issues you are experiencing, if there are triggers that cause biting, or if your dog is biting in play. They can give you advice about how to manage the issue.


3. Resource Guarding

Puppies raised in these operations may have to fight for food and other resources, setting the stage for resource guarding. They have possibly even been deprived of their basic needs, leading them to be insecure about where their next meal is coming from. These pups can jealously protect their favorite toys, food, and treats. It isn’t limited to other dogs; the animal may see any household member as a potential threat. Some pets may take something and hide with it, growling at anyone who approaches them.

  • What to Do:

Please don’t attempt to tackle this problem on your own. You will need to reach out to a vet or animal behaviorist. In the meantime don’t approach your dog when they are resource guarding and let them eat their meals in peace.

Puppy dogs waiting in the dog shelter behind the cage in Italy
Image Credit: FannyF, Shutterstock

4. Aggression, Hyperactivity, Anxieties

Behavior can be largely influenced by genetics.3 Studies have found genetic links to hyperactivity, anxiety, and aggression. Responsible breeders select parents to improve their breed including the looks, health, and temperament. Since puppy mills are characterized by indiscriminate breeding practices, meaning as long as a dog can produce puppies they will be used, these pups are not selected for temperament or health, and could possibly be more prone to behavioral issues. Not only that but the severe stress they have experienced in their life will leave some psychological scars and affect their behavior.

  • What to Do:

Work on gradual, positive exposure to everyday life experiences. Be sure to provide your dog with plenty of physical, mental, and environmental enrichment. Never put yourself or anyone else at risk of being bitten. Again, counterconditioning and desensitization are excellent behavioral modification techniques for dealing with these issues. Seek help from your vet for medication and training advice for your specific situation.


5. Destructive or Housesoiling Behavior

Puppy mill dogs are usually used to being housed in their own filth. Most have never had any toilet training, so the concept of taking themselves out to the toilet is completely foreign to them. Additionally, they have never been taught not to destroy people’s belongings and can do so, not only for fun (it’s a natural desire for a dog to chew), but also out of boredom or anxiety.

  • What to Do:

Work on issues like boredom or separation anxiety that could lead your dog to become destructive. Seek help and medication from a vet if necessary. Never get frustrated or punish your dog for doing the wrong thing; remember where they came from, it’s not their fault that they are comfortable in unsanitary conditions and were never taught good habits. Take your dog outside regularly, especially after meals and naps. Give your dog positive reinforcement for going to the toilet outside and make sure this is repeated consistently to cement the lesson.

Guilty dog and a destroyed teddy bear at home
Image Credit: Aleksey Boyko, Shutterstock

6. Compulsive Behavior and Stereotypies

Spinning in circles, pacing, and blank stares are common to see in dogs that have come from puppy mills. Stereotypies are typically thought about in zoo animals, hence the name “zoochosis”, however, they can be seen in dogs with inadequate housing, as in puppy mill scenarios. Stereotypies are repetitive behaviors that are aimless and out of context, which occur secondary to environmental stressors. Brain changes are common in dogs with stereotypies, and these behaviors become a habit in time.

  • What to Do:

Start by providing all the physical, mental, and social needs for your dog. Talk to your veterinarian about the behavior as medication is likely needed. Recognize that your dog may never be able to completely kick these habits, but that they can be managed, especially with behavioral modification training practices.

divider dog paws 3 oct 2024

Factors to Consider When Getting a Puppy

Research has shown no benefit to getting a puppy under 8 weeks old. It is not going to encourage a stronger bond with pet owners. Dogs need this time with their mothers and littermates for proper social and mental development. One can overemphasize the importance of this period. It provides a safe place for puppies to learn how to act and behave.

Therefore, we strongly urge you to get a puppy over 8 weeks old, preferably 12 weeks old. They will make a much better pet with some experience. We also suggest seeing the pup with their mother and littermates if possible, so you can see the temperament of the parents and how well they are cared for. However, beware of backyard breeders, which can pose the same behavioral risks as puppy mills.

Instead, only buy from reputable breeders and rescues who conduct the recommended health and behavioral screenings. These places should be a great source of knowledge about dogs and how to prevent and deal with various behavioral issues. Another risk of getting a dog from a puppy mill is a heightened chance of hereditary and congenital conditions, due to indiscriminate breeding practices. Inbreeding can increase these risks.

woman holding an 8 weeks old smooth hair brown dachshund puppy
Image Credit: Alena Veasey, Shutterstock

divider dog paws 3 oct 2024

Conclusion

Fortunately, many pet stores no longer sell dogs from puppy mills. Sadly, these animals do not always get the chance to socialize with other people or pets and are raised in poor conditions, making them vulnerable to behavioral issues. Don’t be afraid to ask questions of a seller when looking for a new puppy. Request to see the pup’s mother and littermates. Choose wisely so you don’t end up supporting a puppy mill.


Featured Image Credit: khlungcenter, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything dog

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.


How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Dogster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Is a Cavalier King Charles Spaniel Hypoallergenic? Breed Facts & FAQ

With their sweet faces and constantly wagging tails, Cavalier King Charles Spaniels are generally considered one of the all-around best-tempered dog breeds. These...

Defensive Aggression in Dogs: Vet-Verified Triggers and FAQ

Aggression is one of the biggest reasons pet owners seek the help of animal behaviorists or dog trainers. There are many different types...

5 Vet-Approved Cockapoo Haircuts You Can Give Your Pup (With Pictures)

The unique Cockapoo coat leaves much room for some pretty impressive hairstyles. You can change up your Cockapoo cut every time you send...

Can Dogs Eat Parsley? Vet-Verified Facts & FAQ

You might be familiar with parsley as a common ingredient in cooking, but the herb also offers many health benefits and is considered...

More related

Why Do Dogs Smell Each Other’s Butts? Vet Reviewed Behavior Guide

Every pooch parent has, at some point, felt mildly embarrassed when their dog heads straight for another dog’s rear end while out on...

Dogster Photo Contest: Dogs of the Week Winners (August 14, 2025)

Every week our team gets the privilege of sorting through our readers photos to choose what dogs will win this weeks contest! See...

11 Dog-Friendly Wedding Venues in the US (2026 Guide)

Getting married is an event that will literally alter the course of the rest of your life. There are so many things to...

7 Best Puppy Toys in 2026 – Reviews & Top Picks

As any dog owner knows, picking out the perfect toy for a young dog can be a little tedious. If it’s too big,...

Keep reading

Dr. Marty Nature’s Blend Dog Food Review 2026: Our Expert’s Opinion

Review Summary Dr. Marty is a pet food company founded by long-time veterinarian, Dr. Marty, whose focus for the past 45 years has been on creating healthy and nutritious all-natural foods for dogs and cats. Dr. Marty’s mission is to...

Dogster_Dr. Marty Nature’s Blend Dog Food Review

Can Dogs Drink Oat Milk? Vet-Reviewed Facts & FAQ

If you’ve recently switched from cow’s milk to oat milk or another plant-based dairy alternative, you may wonder if dogs can drink oat milk. Although dogs do not need to consume milk once they have been weaned from their mothers,...

oat milk in a glass

Victor Puppy Food Review 2026: Recalls, Pros & Cons

Review Summary Victor is a line of dog food that may not be on every store’s shelves but should be. This food is affordable and well-balanced with lots of protein, healthy fats, and carbs that growing puppies need. The only...

Dogster_Victor Puppy Food Review

10 Best Dog Foods for Pomeranians in 2026 – Reviews & Top Picks

Pomeranians have vastly different nutritional needs than dogs of larger breeds. Small dogs have higher metabolic rates than larger dogs and need to take in a sufficient number of calories to stay healthy. You might be surprised to learn that...

Pomeranian eating dry food from green bowl

9 Best Treats for Dogs With Sensitive Stomachs in 2026: Reviews & Top Picks

No matter who you are, you probably give your dogs treats at least once every month or so, whether it’s for training or just because they’re good puppies. However, dogs with sensitive stomachs may struggle with this normal part of...

jack russell terrier having treats

Answers Dog Food Review 2026: Recalls, Pros & Cons

Review Summary You may have heard of raw dog food, but have you heard of fermented dog food? Fermented foods are packed full of health benefits, providing your dog with the nutrition they need. Answers dog food has brought fermented...

Dogster_Answers Dog Food Review

Tailored Dog Food Review 2026: Recalls, Pros & Cons

Review Summary We all want the best for our canines, including giving them only the freshest, protein-based, high-quality food. Tailored Pet is said to do just that with their direct-to-customer, personalized dog food. The food arrives in a recyclable cardboard...

Dogster_Tailored Dog Food Review

Can You Return Dog Food to Walmart? What You Need to Know

Have you ever adopted a new puppy and tried several different puppy foods to find something he loves, but he’s just not into anything you’re offering him? Or has your older dog suddenly developed an aversion to the food he’s...

woman buying dog food