TL;DR

Mariska Nell sits down with science writer and longtime National Geographic contributor Jennifer S. Holland to explore what it really means to be "dog smart." Jennifer shares stories and insights from her latest book, Dog Smart: Life-Changing Lessons in Canine Intelligence, including why an estimated 85% of the world's dogs aren't pets, how street dogs adapt and thrive, and what search-and-rescue and cancer-detection dogs reveal about canine superpowers. They dive into everyday intelligence, like the quiet genius of a dog waiting at the window, why so-called "bad dogs" are often just misunderstood or under-exercised, how ear cropping and tail docking can impact communication, and why letting dogs sniff, move, and "be dogs" is one of the most loving things we can do. The conversation blends science, personal stories (including Mariska's Frenchie Piper and Jennifer's dog Monk), and practical takeaways for modern pet parents who want to better understand and support their dogs' emotional and cognitive lives.

Guest Bio:

Jennifer S. Holland is a science and nature writer with a long career as a staff writer at National Geographic. Her work focuses on animals, conservation, and the natural world, and she is the bestselling author of the Unlikely Friendships book series, which shares true stories of surprising bonds between animals. Her latest book, Dog Smart: Life-Changing Lessons in Canine Intelligence, examines what it means to be smart in the world of the dog, weaving together cutting-edge research, field reporting, and stories from trainers, working dogs, and beloved pets. Jennifer lives with her dog Monk and continues to write, speak, and share about the rich inner lives of animals.

During This Episode:

• Jennifer Holland's background as a National Geographic staff writer and bestselling author of the Unlikely Friendships book series
• Why she turned her attention to dogs specifically for her latest book, Dog Smart
• Why an estimated 85% of the world's dogs aren't pets, and how street and roaming dogs adapt and thrive
• Monk's bed-spot trick: an everyday example of canine problem-solving
• Talking buttons and what they reveal about cause and effect, connection, and communication
• How dogs are trained to sit still in MRI machines, and what that research reveals about canine cognition
• A search-and-rescue scent-tracking story that shows the scale of canine scent detection
• How signals, cropped ears, and tail docking affect a dog's ability to communicate, and why it's on us to step up for them
• Why "bad dogs" are often just misdirected intelligence rather than a behavior problem
• Why exercise, both physical and cognitive, is non-negotiable for a well-adjusted dog
• Our responsibility as pet parents: sniffing, breed needs, and true partnership with our dogs
• A deeper truth about intelligence and the value of every dog's existence, pet or not
• Jennifer's signature takeaway: "let dogs be dogs"
• Jennifer's one message to every pet parent

Takeaways:

• Dogs are communicators first. Body language, subtle signals, and redundancy matter, and cropped ears or docked tails can limit a dog's natural communication tools, so supervise thoughtfully.
• 85% of the world's dogs aren't pets. Street and roaming dogs occupy a valid ecological niche, and their adaptability is a form of intelligence in its own right.
• Genius comes in many forms. From cancer detection to waiting at the window, "smart" includes problem-solving, emotional attunement, and connection.
• Training isn't just about obedience. Many "bad behaviors" are unmet needs or misdirected intelligence, and compassionate, consistent training, with the right trainer, changes outcomes.
• Exercise is non-negotiable. Physical and cognitive work together reduce frustration and destructive behaviors.
• Let dogs be dogs. Sniffing is learning, exploration builds optimism, and partnership matters more than possession.
• Talking buttons are a fun extra. They're useful for enrichment and cause-and-effect learning, while dog-forward communication still comes first.
• Humility helps. Understanding dogs well can make us better, more observant humans too.

Relevant links mentioned in the episode:

Jennifer’s website

Dog Smart the book

Jennifer's Unlikely series books

Jennifer on social: Instagram/TikTok / Facebook

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Timestamps to relevant points within the episode:

[00:00]- Intro

[02:00] – Welcome, Jennifer’s intro

[03:40] – Jennifer’s origin story & “why dogs”

[07:30] – 85% of dogs aren’t pets; street-dog intelligence

[10:55] – Monk’s bed-spot trick: everyday problem-solving

[12:48] – Talking buttons: cause/effect & connection

[15:49] – Dogs in MRI machines—how they trained it

[22:00] – Search-and-rescue scent tracking story

[20:15] – Signals, cropped ears, and stepping up for our dogs

[27:57] – “Bad dogs” as misdirected intelligence

[30:01] – Exercise is everything (physical & cognitive)

[31:56] – Responsibility: sniffing, breed needs, partnership

[35:51] – A deeper truth about intelligence & existence value

[39:04] – Signature takeaway: “Let dogs be dogs”

[41:00] – Jennifer's one message to every pet parent

[42:31] – Outro

FAQ

How smart are dogs, really?

Dogs possess adaptive, social intelligence rather than human-like intelligence. They excel at reading emotion, solving problems relevant to their environment, and using extraordinarily sensitive scent detection, all shaped by thousands of years of co-evolving alongside humans.

Are most dogs in the world actually pets?

No. An estimated 85% of the world's dogs are free-roaming rather than household pets, which reframes what a "normal" or valid dog life looks like beyond the pet-owning world.

Can dogs really detect cancer by smell?

Yes. Research discussed in Jennifer Holland's book Dog Smart shows dogs can detect certain cancers and diseases through scent, demonstrating a sensory intelligence far beyond human capability.

What do MRI studies reveal about how dogs think?

Dogs can be trained, using positive reinforcement, to lie still in MRI machines, and the resulting brain scans are helping researchers understand how dogs process human voices and emotional tone.

Why do ear cropping and tail docking affect a dog's communication?

Ears and tails are key tools dogs use to signal intent and emotion to other dogs, so removing or altering them can strip away natural communication cues, making interactions with other dogs riskier or more easily misread.

Is my "badly behaved" dog just being difficult?

Not usually. Behavior problems are very often a sign of unmet physical or cognitive needs rather than defiance, and addressing the root cause, through more exercise, more mental stimulation, and better training, typically resolves it.

Why is it important to let my dog sniff during walks?

Sniffing is a dog's primary way of gathering information about their world, and letting them sniff freely on walks supports a more optimistic, well-adjusted temperament, so it's meaningful enrichment, not just a delay.

What does "let dogs be dogs" mean in practice?

It means recognizing that dogs are an entirely different species with their own instincts, needs, and ways of experiencing the world, and making space for those needs (sniffing, exercise, problem-solving) rather than expecting them to behave like small humans.

About the Author: Mariska Nell

Mariska is the founder of Tails and Tones, a design-led, sustainable dog product brand. She's also the host of the Tails and Tones podcast, where she explores dog health, product design, and intentional pet parenting with experts, veterinarians, and fellow dog parents.

Background: Mariska holds a Master's degree in Sustainable Design, a Bachelor's in Interior Design, and a Postgraduate qualification in Environmental Science. She's spent over 10 years working as a sustainability designer and strategist across the UAE, Australia, South Africa, the UK, and India. Her previous work includes collaborations with brands like Nespresso, Costa Coffee, and Dubai Airport, and she founded Design By Mariska, known for trash-to-treasure art exhibited at Dubai International Airport. She's also the host and founder of Mama Earth Talk, a sustainability podcast with 200+ episodes on zero waste and climate action, featuring guests including Dr. Sylvia Earle and the late Dr. Jane Goodall. She created the free Living Lighter course for practical sustainable living.

Piper: Mariska shares her life and work with Piper, her French Bulldog rescue dog. Piper joined the family in 2021 at 5 months old and has been the Chief Paw-duct Tester for everything Tails and Tones creates. Piper's journey, including cleft palate repair, luxating patella, arthritis risk, and recent mobility challenges, directly shaped the founding mission of Elevé (Tails and Tones' first product: a modular, height-adaptive feeding system).

Mission: We are on a mission to help modern dog parents simplify everyday care and elevate life with their pets, without sacrificing style or sustainability. Tails and Tones exists to build products that show up for dog parents, beautiful, sustainable, and robust enough to support you on the worst days. Not just the easy ones.

You can find Mariska at @tailsandtones on Instagram, or visit tailsandtones.com to learn more about Elevé and the Tails and Tones mission.