★★★★★  4.9 from 1,200+ client reviews
Balanced dog training since 2013 · Serving 7 states across the US
Call us: 415-583-5412
Home Locations California South Bay Aggressive Dog Training
South Bay · Aggressive Dog Training

South Bay Aggressive Dog Training

For dogs with big behaviors, and families who won’t give up. If the reactivity, anxiety, fear, or aggression feels unfixable, we want you to know it’s not. Rebuild trust. Create structure. Enjoy life with your dog again.

3–8 week programs Max 5 dogs per trainer weekly photo & video updates
★★★★★

“Whether we’re your first call or your last hope.”

Programs from $3,600 · GPS collars · Max 5 dogs
How does aggressive dog training work in South Bay?

At Koru K9, your dog lives in the loving home of one of our experienced professional dog trainers — never in a crowded facility. Your dog’s daily routine includes structured training sessions tailored to their needs, along with playtime, exercise, and rest. When training is complete, we personally deliver your dog back to you and conduct your first go-home lesson.

Problem behaviors we help with

Behavior we work with in South Bay

If the reactivity, anxiety, fear, or aggression feels unfixable, we want you to know it’s not.

Tell Us About Your Dog

Aggression

Dog-to-dog aggression, Human aggression, Resource or food guarding, Dogs fighting

Fear & Anxiety

Fear based behaviors, Separation anxiety, Generalized anxiety, Destructive behaviors

Obedience Issues

Pulling on leash, Not coming when called, Jumping, Excessive barking

Our philosophy

Let the heeling begin.

Ever wonder why some South Bay dog Board & Train programs promise quick fixes or take a one-size-fits-all approach, only to leave you with unreliable results and behaviors that come back? That doesn’t mean your dog is broken — it means they need a different approach.

At Koru K9 Dog Training in the South Bay, our Board & Train programs are built for real-life success — not shortcuts. We focus on lasting behavior change through connection, consistency, and clear communication.

Real-life training in real environments. Each day includes structured sessions, field trips, and exposure to everyday distractions — city sidewalks, parks, and real streets, never a kennel run.
1–5
Client dogs per trainer — never more
Photo & video updates weekly
GPS
Collars & secure home environments
0
Kennels — home-based, always
How it works

How aggressive dog training works in South Bay

We treat every dog as if they were our own — because we know how much they mean to you.

1

Pick-up day

Pick up and drop off are part of every program. Your dog travels safe and settles into their trainer’s home.

2

Life in a real home

Your dog lives with a professional trainer — structured sessions plus playtime, exercise, and rest, never a crowded facility.

3

Real-world training daily

City streets, parks, and field trips — with at least two photo/video updates per week so you follow the progress.

4

Delivery & go-home lesson

We personally deliver your dog back and teach you everything they’ve learned — plus two follow-up lessons.

Your local team

Koru K9 trainers serving South Bay

Local trainers who live and work where you do.

David Besseler

Northern California
Certified Behaviorist

David currently runs his own full-time dog walking business, where he works hands-on with dogs of all temperaments and energy levels every day.

Read full bio

Debbie Port

Northern California
Dog BehavioristMichael Ellis School +1

Debbie Port grew up riding and training horses professionally. She trained her own dogs on the side and over the years got interested in dog sports.

Read full bio

Becca Contreras

Northern California
Dog BehavioristBalanced School for Dog Trainers

Becca has been training dogs professionally since 2011. During that time, she has made the transition from a purely positive trainer to balanced training, after seeing the limitations of purely positive training, particularly…

Read full bio

Jourdan Murphy

Northern California
Dog Behaviorist

Jourdan was born and raised in Santa Cruz County. Her passion and love for dogs started at a very young age. Jourdan has owned high drive, working breeds her entire life, and realized, at a young age, that she had a natural…

Read full bio

Celeste Schmidt

Northern California
Dog Behaviorist

From the time she was young Celeste always had a deep passion for animals. Learning as much as she could and spending her free time with the family dogs.

Read full bio

Maddie Galati

Northern California
Dog Trainer & Behaviorist

Maddie has always had a passion for dogs. Aside from growing up with them, as soon as she graduated high school she was volunteering with a local German Shepherd rescue and shadowing a balanced trainer.

Read full bio

David Besseler

Northern California
Certified Behaviorist

David currently runs his own full-time dog walking business, where he works hands-on with dogs of all temperaments and energy levels every day. Through this work, he gained a deep appreciation for canine behavior, communication, and the importance of structure and consistency.

His interest in training grew after working with one of Koru K9’s top trainers to help his own reactive dog, an experience that showed him how powerful the right training approach can be in improving both behavior and quality of life. Inspired by those results, David decided to pursue dog training to help other owners build stronger, clearer relationships with their dogs.

He uses a balanced approach, combining positive reinforcement with fair, appropriate corrections, and focuses on practical, real-world skills that help dogs and humans succeed together.

Debbie Port

Northern California
Dog BehavioristMichael Ellis SchoolAKC Evaluator

Debbie Port grew up riding and training horses professionally. She trained her own dogs on the side and over the years got interested in dog sports. Over the past 15 years she has taken clinics and seminars to better her training for her dogs.

As she educated herself more she decided to switch from helping horse owners to having better relationships with their horses to helping dog owners to have better relationships with their dogs. She attended the Micheal Ellis School for dog trainers and is an AKC Evaluator for the Canine Good Citizens, Community Canine, Urban Canine and Tricks Dog certifications.

Committed to providing the most effective, convenient solutions to her clients dog training needs, Debbie advidly pursues ongoing continuing education and provisional development by attending several seminars per year and keeping current on all industry literature.

When not helping clients to enjoy easier lives with their canine companions, Debbie trains her own dogs in IGP (Schutzhund), ring sport, AKC obedience and dock diving.

Becca Contreras

Northern California
Dog BehavioristBalanced School for Dog Trainers

Becca has been training dogs professionally since 2011. During that time, she has made the transition from a purely positive trainer to balanced training, after seeing the limitations of purely positive training, particularly when it comes to behavior modification. Becca managed a successful daycare, and board & training facility in her home town of Chico, CA.

Her experience at this facility allowed her to gain invaluable experience in dog behavior through working with a wide variety of dog breeds in diverse environments. Becca’s own personal dog, Smokey, a German Shepherd mix, proves that, at 12 years young, it’s never too late to train! A year later Becca adopted an Australian Shepherd, named Bentley, who had resource guarding issues as well as reactivity towards people.

We are happy to report that, through balanced training, Bentley is a calm, cool, and collected guy, and is one of our staff dogs used to help other reactive dogs. Becca has continued expanding her training by obtaining her certification through the Balanced School for Dog Trainers.

Jourdan Murphy

Northern California
Dog Behaviorist

Jourdan was born and raised in Santa Cruz County. Her passion and love for dogs started at a very young age. Jourdan has owned high drive, working breeds her entire life, and realized, at a young age, that she had a natural affinity for training. The beginning of Jourdan’s career in canine training started with her seeking a higher level of training for her Australian Cattle Dogs.

She took them to an Obedience & Agility class at a local police K9 training facility. The facility owner had been training dogs fro over 30 years, and immediately identified Jourdan’s potential, and offered Jourdan her first apprenticeship.

Upon completion of this apprenticeship, Jourdan began private lessons, and group classes in obedience, protection, and agility, as well as board and trains for dogs with behavior issues, and for mobility and medical alert service dogs, and puppy raising. Jourdan’s interest for protection training and sports was peaked, and she began attending protection and obedience seminar or workshop she could.

Through these seminars and workshops, Jourdan has trained with some of the best, and most inspiring trainers in the world. She has competed at a national, and International level with her personal Belgian Malinois, and has trained and titled multiple dogs / breeds.

Jourdan who is forever a student of her craft, is happy to pass along her years of experienced, and education to her clients, and is excited to see her client dogs become happy, confident, engaged dogs.

Celeste Schmidt

Northern California
Dog Behaviorist

From the time she was young Celeste always had a deep passion for animals. Learning as much as she could and spending her free time with the family dogs. In her early teens she got her first dog Dakota, who had severe fear aggression towards people, and fear-based reactivity towards other dogs.

She reached out to local trainers to work with him. That turned into Celeste mentoring with those trainers and eventually becoming their assistant trainer. These trainers worked for an animal shelter, and Celeste assisted them in training and rehabilitating the shelter dogs that had behavior issues.

She learned the importance of timing, consistency, and balance, and worked Dakota through his behavior issues. Dakota was such a success story that he became their go-to demo and training dog! Little did Celeste know at that time that she would eventually end up fulfilling her mentors’ role, and become the lead trainer for the shelter.

Celeste was also responsible for evaluating the temperament of all the dogs at the shelter, giving her a tremendous depth of experience in dealing with a wide variety of breeds, temperaments, and behavior issues. In her spare time, she began training Dakota in sport work — successful competing with and titling Dakota.

It was through this process she discovered her passion for German Shepherds, and went on to compete with and title her first GSD, as well as train him up to be her Medical Service Alert Dog. Since that time, she has also gone on to start her own, successful breeding program for German Shepherds as well.

Maddie Galati

Northern California
Dog Trainer & Behaviorist

Maddie has always had a passion for dogs. Aside from growing up with them, as soon as she graduated high school she was volunteering with a local German Shepherd rescue and shadowing a balanced trainer. After that, she began working for a company that did behavior modification and working dogs.

From there, her passion grew for working dogs and she started working with detection canines in the school system and conservation detection canines that detect invasive species. Maddie was a competitor on Americas Top Dog Season 2 and is now working towards PSA (Protection Sport Association) titles with her Malinois.

When Maddie is not working with dogs she enjoys working out, traveling and hiking (dogs are typically still included here though!).

More reviews

Results from families like yours

Verified reviews from clients across every market we serve.

★★★★★

“We trained our 2 fur babies with Will Greenway. One is an 8 year old Australian Shepherd and the other a 3 year old Rough Collie.”

DW Danielle W.Verified client review
★★★★★

“I got the package with 3-sessions of private training (with one 1-2 hour consultation on top of that) and my trainer was Alex.”

AB Avyla BarrettVerified client review
★★★★★

“Walks used to be stressful, with constant pulling and lack of focus—but Halley A. has transformed that experience completely.”

MM Marisa MadridVerified client review
Questions

South Bay aggressive dog training FAQs

It is a specialized rehabilitation program for dogs exhibiting human aggression, dog-on-dog aggression, resource guarding, or bite histories, using balanced in-home coaching or 24/7 residential Board & Train.

Aggressive dog training costs vary by format and case severity. In-home behavior coaching typically ranges from $150 to $250 per session, while comprehensive 3-to-6-week residential Board & Train programs range between $3,900 and $7,500 depending on the rehabilitation required.

Reactivity is an overreaction driven by fear, frustration, or arousal (such as barking or lunging on leash). Aggression involves intentional force to cause harm, such as snapping, biting, or resource guarding. Koru K9 rehabilitates both conditions.

Other dog training programs in South Bay

Dog Board & Train

Dog Board & Train for South Bay dogs and their families.

Explore Dog Board & Train →

In-Home Dog Training

In-Home Dog Training for South Bay dogs and their families.

Explore In-Home Dog Training →

Dog Behaviorist

Dog Behaviorist for South Bay dogs and their families.

Explore Dog Behaviorist →

Your companion is worth it. Your peace of mind depends on it.

Whether we’re your first call or your last hope, Koru K9 will meet you — and your dog — where you are, and help you build the calm, confident companion you’ve been searching for.