How To Tell If Your Dog Is Sick [Warning Signs Every Owner Should Know]

Zack Keithy, our author, is a certified veterinarian technician (UC Blue Ash) for over 6 years (contact him here). The articles written here are based on his expertise and experience, combined with a review by our expert vet reviewers including Dr M. Tarantino. Learn more about us here.

Wondering how to tell if your dog is sick? Spotting dog health symptoms early can make all the difference between a minor issue and a major health crisis.

Dogs might not verbalize their discomfort, but they sure do drop hints.

This guide will help you understand those signals by covering common symptoms like changes in appetite or behavior, and when it’s time to call your vet for professional advice.

Let’s ensure your pup’s tail keeps wagging happily!

How To Tell If Your Dog Is Sick

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Understanding Dog Behavior Changes

Dogs are like your favorite mystery novel—sometimes, it takes a bit of detective work to figure out what’s really going on.

When you notice behavioral changes in your furry friend, it might be their way of sending out an S.O.S.

Understanding these changes can be crucial in identifying potential dog illness indicators.

Appetite Changes

One of the first signals that something might be off is a sudden change in appetite.

If your pooch is suddenly channeling their inner food critic and turning their nose up at meals, or conversely, if they’re devouring everything like they’ve just discovered the joy of bacon for the first time, it could be a red flag.

It’s kind of like us humans, and this shift can hint at various underlying health issues ranging from dental disease to more serious gastrointestinal problems.

Social Withdrawal or Aggression

Is your usually cuddly canine suddenly acting like they’ve joined a punk band?

Increased aggression or withdrawal from social interactions may not just be their new rebellious phase.

It’s often linked to discomfort or pain.

Dogs don’t have the luxury of telling us when something’s wrong with words—they rely on actions instead.

Excessive Vocalizations and Restlessness

A dog that’s suddenly become a chatty Cathy with excessive barking or whining might be trying to tell you something important.

Similarly, if they’re pacing around the house like they’re training for a marathon, they could be uncomfortable or unwell.

These behavioral changes often suggest that your dog isn’t feeling quite right and might be experiencing some sort of distress.

5 Basic Warning Signs to Watch For

warning signs that your dog is sick

Our dogs, those lovable goofballs, are great at hiding when they’re not feeling well.

It’s up to us, the ever-watchful pet parents, to pick up on any sneaky signs of trouble.

Here’s your quick guide for spotting potential dog health issues that might be right in front of you.

1. Appetite and Water Intake

Changes in Appetite

Your dog’s food bowl tells tales.

A sudden lack of interest in their chow could be a red flag for problems like dental disease or stomach issues.

On the other hand, if your pooch is suddenly eating a lot more than usual, it might indicate conditions such as diabetes or thyroid imbalance.

Water Consumption

Hydration is crucial for our canine companions.

A noticeable increase or decrease in water intake can be more than just a quirk.

Drinking too much might suggest conditions like kidney issues or Cushing’s disease, while drinking less could signal an underlying illness that needs a vet’s attention.

2. Energy Levels and Behavior

Dogs love naps, but if your usually energetic buddy is becoming a couch potato, you might have something to figure out.

If your pup suddenly shows no interest in walks or playtime, it might be more than just laziness.

Lethargy can hint at dog sick symptoms ranging from infections to long-term illnesses that need looking into.

3. Vomiting and Diarrhea

Occasional tummy troubles can happen to the best of us (or our dogs).

But if they’re throwing up or having diarrhea a lot?

That’s not something to ignore!

These symptoms could lead to dehydration and often point towards dog illnesses needing medical help.

4. Coughing

While one cough isn’t cause for alarm, frequent coughing can indicate breathing issues such as kennel cough or more serious conditions like heart disease.

5. Weight Fluctuations

Your dog’s weight is another piece of the health puzzle.

If Fido’s looking slimmer without hitting the doggy gym, it might signal metabolic disorders or even cancer.

On the other hand, gaining weight without extra treats can also be concerning.

It may point toward hypothyroidism or other hormone-related disorders that need exploring.

Recognizing 6 Severe Symptoms That Require Immediate Attention

severe symptoms that your dog is sick

What we’ve covered above are somewhat common, and while they do ring alarm bells, they’re definitely not as loud as the ones discussed here.

These are some critical signs that indicate it’s time to call the vet immediately.

1. Breathing Problems

If your dog is struggling to breathe or making wheezing sounds, it could be a sign of:

2. Frequent Vomiting or Diarrhea

While occasional stomach issues can happen, repeated vomiting or diarrhea can lead to dehydration and might indicate a more serious problem in their digestive system.

3. Seizures

Seizures can be terrifying to witness and may appear as uncontrolled muscle movements or brief confusion. They could be caused by:

4. Swelling and Open Wounds

Unexpected swelling might result from infections, abscesses, or insect bites.

If you notice swelling along with open wounds or unexplained pain, it’s time for a vet visit.

5. Signs of Pain

Dogs often hide their pain well, so if they’re limping, whining, or excessively licking one area, you can safely assume something is wrong somewhere.

6. Enlarged Belly

If your dog’s stomach suddenly looks like a balloon, it could be a sign of bloat (a life-threatening condition) or internal bleeding.


All of these symptoms are urgent signals that require immediate attention from a veterinarian, so don’t wait around!

The Importance of Regular Veterinary Check-Ups for Your Dog’s Health

I wish my dogs can speak to me, but obviously we know that’s not gonna happen.

This is where preventive care for dogs comes in.

Regular vet check-ups are your secret weapon in catching potential issues before they become serious problems.

Why Regular Vet Visits Matter

  1. Spotting Hidden Issues: Just like how we can miss that missing sock in the laundry, certain dog health issues can sneak by unnoticed. Routine visits give your vet a chance to detect these stealthy problems early on.
  2. Tailored Advice: Not all dogs are created equal. Some might need more frequent check-ups due to breed-specific risks or age-related concerns. Your vet can provide personalized advice on how to keep your furry friend in tip-top shape.
  3. Peace of Mind: Knowing you’ve got a professional keeping an eye on your pup’s well-being is priceless.

Regular check-ups aren’t just about vaccinations; they’re about ensuring your dog’s health gets the attention it deserves.

So next time you’re wondering how to tell if your dog is sick, remember that a proactive approach with regular vet visits is key.

Keeping an Eye on Behavioral Signals

The bottom line is that monitoring your dog’s behavior is like keeping tabs on your favorite TV series—you don’t want to miss an episode!

Regularly observing any deviations from their usual antics can provide early warning signs of illness, and is really one of the most important jobs we dog owners have.

Being proactive about these behavioral changes ensures that if there’s an issue lurking beneath the surface, you’re ready to tackle it head-on with the help of your trusty vet sidekick.

Understanding these subtle cues can make all the difference in catching potential health concerns before they escalate into something more serious.

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Zack Keithy
Zack Keithy

Hey, I'm Zack, the Chief Editor here. I was formerly a Certified Veterinary Technician (CVT) for a good 6 years before moving on to greener pastures. Right now, I am still heavily involved in dog parenting duties, and it is my desire to share all our knowledge with fellow dog owners out there! Connect with me on LinkedIn, or read more about Canine Care Central!

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