As a pet parent with an adopted dog, you might not know your dog's exact age. And now his hair, especially around his muzzle, is turning gray. Does a gray muzzle mean he's becoming a senior dog? Or is it a sign that something is wrong?

Gray hair on a dog's face and around his muzzle is a natural occurrence as he ages — just like turning gray is a natural occurrence for humans. Because dogs age faster than humans, they turn gray sooner than their pet parents. And just like humans, some dogs turn gray much earlier in life than others.

Behavior and Health Link

While typically a sign of an aging dog, a gray muzzle can also be found in dogs as young as one year old. A study of 400 dogs, published in Applied Animal Behaviour Science, discovered that dogs that experience high levels of anxiety, are impulsive or have fearful responses to strange people, animals and noises are linked to premature graying — not much different to when you hear people say things like, "you're the reason I am going gray."

A graying muzzle may also indicate a health issue. For instance, premature graying of the muzzle is one sign your dog might have hypothyroidism. Because it could be health-related, you should consult with your veterinarian if your dog starts graying.

Senior Years

Typically, a graying muzzle or face is a sign your dog is entering his senior years. Typically, dogs enter their senior years between the ages of seven and ten, but depending on your dog's size it might be even younger. For instance, giant breed dogs (those that weight 91 pounds or more) can be considered senior by the time they turn five, according to the American Veterinary Medical Association (AVMA). Small and medium breeds (up to 50 pounds) can be considered a senior at around age seven. Genetics plays a large roll in the graying process of your dog as certain breeds or lineages have a predisposition for graying earlier than others. It's also a lot easier to notice a gray muzzle on a dog with darker hair than say a West Highland white terrier.

Dogs that have reached their senior years may benefit from switching to a senior dog food. While it doesn't reverse the causes of graying in your dog, the best senior formulated dog foods offer a nutritional formula that works to ease the effects of aging. For instance, Hill's® Science Diet® Youthful Vitality was developed with the changing biology of pets ages seven and above in mind. The breakthrough nutrition found in the Science Diet® food is made with Hill's proprietary recipe of natural ingredients including fruits, vegetables, fatty acids and antioxidants plus added vitamins, minerals and amino acids — all of which work together to fight the effects of aging. Its formula is designed to help with brain function, energy and vitality and healthy immune and digestive systems. It also includes essential fatty acids that promote a coat with increased shininess and softness.

Going gray — for whatever reason — might give your dog a new look. But he will still thrive on the same love and attention he's always wanted from you!

Kara Murphy Kara Murphy

Kara Murphy is a freelance writer and pet parent who lives in Erie, Pa. She has a goldendoodle named Maddie.

Related articles

A Dog's Memories: Do They Remember Their Owners?

Discover what types of memories dogs actually have, how their memories work & how long they last, and whether they remember details about their owners.

Effective Ways to Curtail Your Dog's Excessive Barking

Learn the reasons why your dog might be excessively barking, as well as how to train him to recognize when to stop.

Can Dogs Have Asthma?

Can dogs have asthma? Learn more about the clinical signs of dog asthma and how this condition is treated.

Can Dogs Eat Turkey?

Is turkey meat safe for dogs? Learn whether it's OK to feed your dog turkey and important info about certain spices, turkey skin & turkey bones.

How to Ride a Bike With Your Dog: Tips for Success

Discover tips for enjoying a bike ride with your dog: How to decide if your dog is a good fit, planning the first ride, items to bring along & safety tips.

Choosing the Right Food For Your Small Dog's Life Stages

Hill's Science Diet Small & Toy Breed dog foods are designed to meet the nutritional needs for your small dog at every life stage. Learn more here.

Side Effects of Rabies Vaccine in Dogs

Learn about common side effects of rabies vaccine in dogs, as well as less common reactions that indicate you should bring your dog to the veterinarian.

Dealing With Dog Mange

Learn about the skin condition called dog mange: what it is, how to spot the symptoms, and treatments for both Demodectic & Sarcoptic types of the disease.

Walking Big Dogs Safely: Tips and Tricks from Dog Experts

Learn expert tips on the best ways to walk your large breed dog, including training suggestions, which equipment works best, and how to walk multiple dogs.

Walking a Dog in the Rain: Tips for Promoting Activity While Keeping Dry

Learn how to make rainy day walks with your dog enjoyable for you both, including how to encourage him to get outside and wear rain gear.

Dog Food Taste & Types: Does My Dog Like Their Food?

Learn about different types of dog foods, why your dog might actually like certain ones over others and questions to ask your vet about dog food taste.

The Safest Way to Travel With a Dog in the Car

Use these helpful tips for going on a road trip with your dog to keep him safe and happy.

Why Is My Dog Afraid of the Dark?

Discover common reasons why your dog seems afraid of the dark, including things like separation anxiety & traumas, and how to help reduce their fears.

Plastic or Soft Dog Cone? Choosing the Best Elizabethan Collar

Learn all about dog cone collars: Why your pup may need one, choosing the best type, how long they're usually worn and tips to help dogs manage their cone.

Choosing the Best Toys for Your Dog

Play is an essential part of every dog's life. Find out what types of dog toys help them exercise and strengthen their bond with you.

Diabetes in Dogs: What You Need to Know

Learn from a Veterinarian: Discover underlying causes, symptoms & treatment options for diabetes in dogs, as well as which breeds are most susceptible.

How to Make Vet Visits Less Scary for Your Dog

Is your dog scared of vet appointments? Learn tips for calming his anxiety and taking the stress out of his trip to the veterinarian.

Dogs That Shed: Why and What You Can Do

Discover why dogs shed, learn the breeds that shed most & least as well as reducing their excess hair, and how to keep your house clean of loose hair.

Is Hand Sanitizer Bad for Dogs? (& What to Do if They Eat it)

Learn whether hand sanitizer can be toxic for your dog, including potentially harmful ingredients that can be bad, and what to do if they've eaten it.

Important Information About Spaying & Neutering Your Puppy

Learn about the benefits to spaying or neutering your puppy, including questions about the surgery and what to expect after he's done.