When Your Dog’s Behavior Suddenly Changes

Michael Baugh CDBC

Our dogs’ behavior is always changing. They find new interests and interact with the environment in ways we’ve never seen before. That is a sign of a behaviorally healthy dog.

New phobias or aggressive dog behavior are not so healthy. Those kinds of behavior changes can crop up throughout our dogs’ lives for various reasons.

Puppyhood and Adolescence (the first two years)

These are developmental changes. New fears and first-time aggressive behavior are fairly common. Common does not mean they are acceptable or that we should ignore them. On the contrary. We need to intervene and help our dogs at the first sign of fear or aggression. Causes include socialization deficits (our dog’s lack of positive experiences), emotional trauma (including before birth), and genetic predisposition (not always permanent). Early positive reinforcement training can turn this kind of unwanted behavior around when our dog is still young. It’s also a great way to prevent fear and aggression problems.

Adulthood

If our dog begins behaving fearfully or aggressively as an adult, we still need to take action. This is especially true for dogs who have otherwise been joyful and pro-social for the first several years of their life. A sudden change in behavior in our adult dog is a red flag. Our first step is to take the dog to the vet to rule out pain (that’s a big one) or other medical causation. Be thorough. Ask lots of questions. Make note of environmental changes, like a move to a new home, a new partner or roommate, or a baby growing into toddlerhood. Those can all affect our dogs’ behavior. We still recommend positive reinforcement training for adult dogs.

Senior Dogs

When a senior dog’s behavior changes, we look for the same causes we’d consider in a younger adult dog. In addition, we can ask our vet to begin regular senior blood work and test for any cognitive decline. Yes, old dogs benefit from positive reinforcement behavior change training. Age does not impede this. But, a late-in-life development of fear and aggression almost always involves vet care as well.

It’s Not All Bad

Behavior is always changing, from birth all the way until our dogs’ last days. Most of the changes we see are benign, delightful, even cute. Many dogs learn to play in new ways, make new friends (human and dog), discover new toys, or learn to enjoy new favorite sleeping spots (mine loves to sunbathe). Cherish these moments. Remember them. They will become part of the stories you tell long after your sweet dog has passed.

I’ll help with the unwanted behavior. The good behavior changes: those are yours to keep in the most treasured parts of your memory.

Michael Baugh teaches dog training in Sedona AZ and Houston TX. He specializes in fear and aggressive dog training .

The Most Important Lesson I’ve Learned about Dog Training

Michael Baugh CDBC

I have been in the dog training business since 1999. My first client lived in a high-rise on Lake Erie in Cleveland. Her Bichon would steal bits of paper, socks, and underwear, then race around the apartment with his prize. I’d learned enough to help, not bad for a beginner. But I had no clue about the powerful lessons that were still to come.

For years, I read nothing but books about dog behavior. I lost count of the courses, workshops, and seminars, both online and in person. I pursued graduate studies, going deeper and deeper. Learning thrills me.

There were mistakes. Painful losses. Tears. Early on, a large dog sent me to the ER. I sometimes rub my fingers over the scars without thinking. My body remembers.

From all of that — the study, the money spent, the hours invested, and the decades of experience — one lesson stands above the rest. Dog training is about dogs, yes. Teaching dog training is about people.

Prizing the Client

I love the awkward truth of that phrase. Psychologist Carl Rogers coined it as part of his work on unconditional positive regard. As teachers of dog behavior and behavior change, we must care for our human clients as much as their dogs. Rogers suggests that to teach well and to be of real help, we must love our clients.

We do not have to agree with them. But we have to find meaningful common ground. A genuine human connection is not optional. It is the foundation.

Paying Attention Comes First

Dog training should not be a list of problems to solve. We show up with knowledge and experience. We often arrive with solutions ready. But we are not there to teach our agenda.

Listen deeply. Pay attention. Let us discover what our client truly needs and how it fits into their real life with their dog.

Caring for the Relationship That Matters

Teaching dog training is about relationships. It begins with the relationship between trainer and human learner. We prize the client.

More importantly, it is about our client’s relationship with their dog. This is why we teach with intelligence and compassion. It’s why we teach positive reinforcement methods. They protect and grow the relationship between people and their dogs.

Positive reinforcement works. It is love in action.

Love your fellow human, your prized client. Pay attention to them and to what they need. Care for their relationship with their dog.

From the kind woman with her small, fluffy white dog to now, this work continues to nurture me. I can think of no more meaningful way to spend my mental, emotional, and creative energy. I turn sixty this year, nearly half of it spent helping people live better lives with their dogs. When I think about that, I smile.

What a gift. What a joy it is to begin again each day.

Michael teaches dog training in Houston, TX. He specializes in helping people with aggressive dog training.

National Train Your Dog Month: A Celebration of Connection

Every January, dog trainers across the country come together to celebrate National Train Your Dog Month, a campaign created by the Association of Professional Dog Trainers (APDT). It started back in 2010 with a simple goal: to remind people that training and socialization are essential to every dog’s well-being.

The APDT put it beautifully: “Training isn’t just about obedience; it’s about building a relationship.” We are creating connection, communication, and compassion between people and their dogs.

Why January? A Fresh Start for You and Your Dog.

January is a season of new beginnings, fresh goals, and a chance to start again. The APDT chose this month to encourage dog owners to start training early in the year, when routines are still being built and possibilities are wide open.

For many families, training often feels like something they’ll “get to later.” But training is not just a box to check. It’s the foundation of your relationship with your dog. It’s how we help them understand our world, feel safe, and make good choices.

“When we teach with kindness, we create understanding instead of fear.” APDT.

The Mission: Build Trust, Not Tension

The official mission of National Train Your Dog Month is to promote reward-based, positive training methods that strengthen the human–animal bond. The goal isn’t perfection. It’s a partnership. It’s about seeing the world through your dog’s eyes and teaching them how to navigate it with confidence.

My Perspective: Training Is a Lifeline for Fearful and Aggressive Dogs

In my work with fearful and aggressive dogs, training isn’t just about teaching skills. We are building safety. Many of our dogs are scared, and react out of self-protection. Training, when done with compassion, gives them a sense of control in a world that often feels unpredictable.

When a fearful dog learns how to pause and look to their person for guidance instead of panicking, that’s training. When an aggressive dog learns that calm behavior makes scary things go away, that’s training too.

Those moments are quiet victories. They build trust one choice at a time.

That’s why I love the spirit of National Train Your Dog Month. It’s not just tricks or obedience titles. We are helping dogs, especially the challenging ones, find calm, confidence, and connection.

Small Steps, Big Change.

If you’d like to celebrate this month with your own dog, start small. Pick one simple skill or routine that builds trust.

Use reinforcement generously. Speak softly. Notice what your dog gets right. The real magic of training is in those small, shared moments: eye contact, a tail wag, a soft sigh of relief.

If you’re working with fear or aggressive dog behavior, reach out for help. Positive reinforcement–based trainers can guide you safely, without punishment or intimidation. You and your dog deserve a relationship built on safety and respect.

A Month for Connection.

So this January, as trainers across the U.S. celebrate National Train Your Dog Month, let’s all take a moment to remember what training truly is: an act of connection.

Every cue, every treat, every quiet moment says to your dog, “You’re safe. You belong. We’re in this together.”

That’s something worth celebrating — this month, and every month after.

Michael Baugh CDBC teaches dog training in Sedona Arizona and Houston Texas. He specializes in aggressive dog training.