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Signs Your Dog is Sick

By Imogen Sharma and medically reviewed by Cathy Barnette, DVM
published: June 18, 2025 • 2 min. read
brown dog sick at the vet

Most dogs don’t make a big fuss when they’re feeling sick. In fact, many try to hide pain or discomfort altogether. That’s why noticing subtle changes in behavior or habits is the first way to catch illness before it becomes serious. If you’re wondering how to tell if your dog is sick, we’ve got answers. It starts with knowing signs your dog is sick, so you can spot what’s not normal fast.

How to Tell if My Dog Is Sick

Even small shifts in routine can hint at something more. When a dog isn’t feeling well, they often signal it through their body language, behavior, or energy levels, and sometimes all at once.

  • Loss of appetite: A healthy dog usually eats with enthusiasm. Skipping meals can point to digestive upset, dental pain, fever, or infection.
  • Body weight changes: Unexpected weight loss can indicate serious underlying disease, and weight gain can also point to certain medical conditions.
  • Low energy or unusual tiredness: If your dog seems more tired than usual or rests in odd spots away from the family, it could be a sign they’re not feeling well.
  • Behavior changes: Some dogs withdraw and avoid attention, while others become unusually clingy. Any sudden shift in demeanor is worth noting.
  • Digestive issues: Repeated vomiting, soft or loose poop, or unexpected house accidents may indicate a gastrointestinal problem or internal issue.
  • Respiratory symptoms: Coughing, sneezing, wheezing, shortness of breath, or discharge from the eyes or nose could be signs of a respiratory condition that requires prompt care.
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Serious Symptoms May Be Hard to Spot

Sometimes illness sneaks in quietly. You might see small things at first, such as a change in the way your dog moves, drinks, or grooms. Those changes can be easy to overlook, especially if they come on slowly.

Keep an eye out for signs like stiffness when standing, sudden disinterest in stairs or jumping, or excessive licking at one paw or joint. These may point to orthopedic pain or inflammation. A sudden shift in weight, bad breath, or frequent urination could signal internal problems like diabetes, urinary tract infection, kidney trouble, or dental disease.

Trust your instincts. If you’re asking yourself if your dog is sick — there’s a reason. When in doubt, make the call.

How to Help Your Sick Dog

First, take notes. Track symptoms, note when they started, and observe how your dog behaves throughout the day. This gives your vet a better picture of what’s happening.

Avoid giving human medications, even if symptoms seem mild. Keep your dog hydrated and comfortable, and reduce stress by providing a calm, familiar routine while you wait for professional advice.

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Photo of Imogen Sharma
By Imogen Sharma

Imogen has been writing professionally for over seven years and has always had a soft spot for animals. She shares her home with three beloved pets: Dyla...Show more

Imogen has been writing professionally for over seven years and has always had a soft spot for animals. She shares her home with three beloved pets: Dylan, an 18-year-old black cat who pretends to be picky but eats just about everything; Polly, a 16-year-old rescue tortie with plenty of tortitude; and Peppy, a playful jug (a pug/Jack Russell mix) who keeps everyone on their toes.

cathy barnette
By Cathy Barnette, DVM

Cathy Barnette is a veterinarian and freelance writer based in Punta Gorda, FL. Cathy creates educational content for pet owners and veterinary team memb...Show more

Cathy Barnette is a veterinarian and freelance writer based in Punta Gorda, FL. Cathy creates educational content for pet owners and veterinary team members. She is passionate about making complex medical information accessible to pet owners, allowing them to partner with their veterinarians to make informed decisions about their pets’ health. In addition to her human family members, she shares her home with one dog, two cats, and a dove. Cathy Barnette on LinkedIn