# Dog Not Feeling Well: Signs, Causes, and What to Do A dog not feeling well usually shows it through changes you can see: less interest in food, low energy, hiding, pacing, or acting off in ways that are hard to name. Some of these changes are mild and pass in a day, while others point to a problem that needs a veterinarian today. Your job is to judge how far your dog has drifted from normal and how fast things are changing. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Mild, short-lived changes (one skipped meal, a quiet afternoon) can often be watched at home for 12 to 24 hours with free access to water. - Call your veterinarian the same day if your dog has vomited more than twice, has diarrhea with blood, refuses all food for a full day, or seems painful. - Go to an emergency clinic now for collapse, trouble breathing, a swollen belly, repeated unproductive retching, seizures, or a suspected poisoning. - Never give human medications, and never try to make your dog vomit on your own. The wrong first aid can cause more harm than the poison itself [1]. - If you think your dog ate something toxic, contact your veterinarian or the Pet Poison Helpline right away, even if your dog looks fine so far [2]. ## What "Not Feeling Well" Looks Like in Dogs Dogs cannot tell you their stomach hurts or their head aches. They show it through behavior. The signs of a dog not feeling well are often subtle at first, and they usually cluster together. Watch for these changes: - Appetite: skipping meals, sniffing food and walking away, or eating much less than usual. - Energy: sleeping more, lagging on walks, not greeting you at the door, or hiding under furniture. - Behavior: restlessness, pacing, panting at rest, whining, or growling when touched. - Body signs: vomiting, diarrhea, drooling, shaking, a stiff gait, or a tucked belly. - Grooming and habits: not grooming, bad breath that appeared suddenly, or accidents in the house. Pain is one of the hardest things to spot. Dogs cannot describe it, and there is no single test that measures it. Veterinarians rely on behavior and physical signs such as heart rate, blood pressure, and pupil size, but those can vary a lot between individual dogs [3]. That is why your report of "he is just not himself" matters so much. You know your dog's baseline better than anyone. ### What Is Normal A healthy adult dog has a steady routine. Appetite is reliable. Energy is predictable. Stools are formed and consistent in color. Your dog is interested in you, in food, and in the usual household sounds. Normal varies by age and breed. A puppy sleeps a great deal and still plays hard between naps. A senior dog slows down gradually over months, not overnight. A sudden change is more concerning than a slow one. ## Main Causes of a Dog Not Feeling Well The list of possible causes is long, and many of them look identical from the outside. This table covers the common categories and how quickly each one tends to need attention. | Cause | Typical clues | How urgent | |---|---|---| | Dietary upset (eating garbage, table scraps, a new food) | Vomiting once or twice, soft stool, normal energy between episodes | Usually same-day call if it continues past 24 hours | | Infection (viral or bacterial, including gut and urinary) | Fever, diarrhea, vomiting, frequent small urinations, accidents in the house | Same-day visit | | Poisoning (chocolate, medications, plants, household chemicals) | Drooling, shaking, vomiting, tremors, weakness, collapse | Emergency now [2] | | Pain (dental, joint, back, abdominal) | Stiffness, reluctance to jump, guarding the belly, panting at rest | Same-day to urgent | | Organ disease (kidney, liver, pancreas) | Not eating, weight loss, increased drinking and urination, yellow gums | Urgent | | Foreign body or obstruction | Vomiting that will not stop, no stool, painful belly | Emergency now | | Stress or anxiety (new home, shelter, schedule change) | Hiding, pacing, panting, refusing food, clingy behavior | Routine visit if it lasts more than a few days | | Rare surgical problems | Sudden vomiting, inappetence, lethargy in a young dog | Emergency now | Some causes are unusual. A recent case report described pancreatic torsion, a rare twisting of the pancreas, in a 7-month-old Labrador Retriever that came in for vomiting, not eating, and lethargy [4]. That is a reminder that a young dog with those signs still needs real veterinary evaluation, not just a wait-and-see approach. Stress deserves its own mention. Dogs in unpredictable or unstable environments can show measurable changes in stress hormones along with behavior changes [5]. Shelter dogs and dogs with a recent upheaval often eat less, pace, and hide [6]. If your dog's only symptom is behavior change after a move, a new baby, or a schedule shift, stress is a reasonable suspect. If physical signs appear too, get a veterinary exam first. ## Signs of a Dog Not Feeling Well That Mean Emergency Some signs mean stop reading and call an emergency clinic. Do not wait for morning. Go now if you see: - Collapse, fainting, or inability to stand. - Labored breathing, blue or pale gums, or a distended belly. - Repeated retching that brings nothing up. - Seizures, tremors, or sudden blindness. - Uncontrolled bleeding or blood in vomit or stool. - A known or suspected poisoning, even if your dog seems fine [2]. - A body temperature that feels very hot or very cold to the touch. Poisoning is one of the most serious situations a dog can face, and it is common. Some signs appear slowly while others show up fast, which is why you should call as soon as you suspect exposure instead of waiting for symptoms [2][7]. Common signs include vomiting, drooling, tremors, and weakness [7]. If you are unsure what your dog ate, do not guess at treatment. A one-size-fits-all approach does not work for poisoning, and giving the wrong first aid can make things worse [1]. Call your veterinarian or the Pet Poison Helpline and follow their instructions. ### Shaking and Drooling These two signs come up often, and they have a wide range of causes. Shaking can mean pain, fear, low blood sugar, a toxin, or simply being cold. Drooling can mean nausea, dental pain, a foreign object in the mouth, or a toxin [7]. When shaking and drooling appear together and came on suddenly, treat it as urgent. If you also see vomiting, tremors, or weakness, go to the emergency clinic. ### Puppy Not Feeling Well Puppies get sick faster than adults. Their small bodies lose fluids quickly, and their immune systems are still developing. A puppy who is quiet, will not eat, has diarrhea, or vomits more than once needs to be seen the same day. Do not wait to see if it passes. Young dogs can also develop rare surgical problems that present as simple vomiting and lethargy [4], so a veterinary exam is the safer path. ## What to Do at Home While You Wait If your dog's signs are mild and you have a veterinary appointment coming, keep things calm and simple. - Offer water often. Small amounts, frequently. Watch for dehydration, which you can check by pressing gently on the gums and seeing how fast the color returns. If you are unsure, this guide on [dog dehydration symptoms](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-dehydration-symptoms-how-to-tell) walks through the signs. - Skip the food for a few hours if there is vomiting, then offer a small bland meal. If your dog refuses, do not force it. - Keep the room quiet and dim. Let your dog rest without kids or other pets climbing on them. - Take your dog out on a leash for bathroom breaks. You need to see the stool and urine. - Write down times. When did the vomiting start? How many times? When did your dog last eat and drink? This timeline helps your veterinarian more than you might expect. - Do not give human pain relievers, anti-nausea drugs, or antidiarrheals. Several common human medications are toxic to dogs. - Do not induce vomiting unless a veterinarian or poison control tells you to [1]. If your dog is on a prescription medication and has become unusually tired, that is a different situation with its own steps. This article covers it: [what to do if your dog's medication is causing lethargy](/knowledge/veterinary-medicine/pet-medication-guide/what-to-do-if-your-dogs-medication-is-causing-lethargy-when-to-worry). ### Keeping a Sick Dog Comfortable Warmth helps. A dog who is not eating may struggle to hold body temperature, and a coat or extra blanket can support rest and recovery. In one study of outdoor working dogs, dogs slept more when wearing a coat overnight compared with no coat, with the biggest difference during cooler evening hours [8]. You do not need a working dog to apply the idea. A clean, dry, warm resting spot supports a dog who feels unwell. Keep the routine predictable. Feed at the usual times, even if your dog eats little. Speak in a normal voice. Anxiety makes physical symptoms harder to read, and stress itself can shift behavior and physiology [5]. ## What Your Veterinarian Will Check Your veterinarian starts with the story you tell. Then comes a full physical exam: temperature, heart rate, breathing, gum color, hydration, belly palpation, and a look in the mouth and ears. From there, testing depends on the signs. Common next steps include: - Bloodwork to check organ function, blood sugar, and infection markers. - A urine sample, especially with accidents, straining, or increased drinking. If you have noticed frequent small urinations, this article on [dog UTI symptoms](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-uti-symptoms-how-to-recognize) explains what those signs can mean. - Fecal testing for parasites and gut infections. - X-rays or ultrasound for vomiting, a painful belly, or a suspected foreign body. Ultrasound is what identified the rare pancreatic torsion in that young Labrador [4]. - Pain assessment. Your veterinarian may use a structured pain scale, since pain in dogs is judged through behavior and physical signs instead of a single measurement [3]. Treatment depends on the diagnosis. For poisoning, options may include inducing vomiting in a controlled setting, IV fluids, and other medications to reduce how severe the signs become [2]. For pain, the plan might include medication, rest, and weight management. For osteoarthritis, veterinarians use owner questionnaires and pain scoring tools to track how well treatment is working over time [9]. ## Prevention and Monitoring Most of the work happens before your dog gets sick. - Poison-proof the house. Keep chocolate, medications, cleaning products, and toxic plants out of reach. Know the Pet Poison Helpline number before you need it [7]. - Watch the garbage and the counter. Dietary upset from scavenging is one of the most common reasons dogs feel unwell. - Track your dog's normal. Note usual appetite, energy, stool, and water intake. A written baseline makes changes obvious. - Keep preventive care current. Parasite prevention, vaccines, and dental care remove several common causes from the list. - Manage stress during changes. Moves, new pets, and schedule shifts can affect appetite and behavior [5][6]. Give your dog a quiet space and predictable routines. - Weigh your dog monthly. Unexplained weight loss is an early clue for many chronic conditions. - Book senior checkups. Older dogs hide illness well, and twice-yearly exams catch problems sooner. If your dog's only issue is behavior that worries you, this guide on [how to know if your dog has behavior problems](/knowledge/veterinary-medicine/behavior/how-do-i-know-if-my-dog-has-behavior-problems) can help you sort out what needs training and what needs a medical workup. ## Limitations and When to Contact a Veterinarian No checklist replaces an exam. Dogs hide illness, signs overlap between mild and serious conditions, and only a veterinarian who examines your dog can sort out what is happening. Individual cases need a veterinarian's judgment. Use these timing rules: - Emergency now: collapse, breathing trouble, seizures, a swollen or painful belly, repeated unproductive retching, uncontrolled bleeding, or any suspected poisoning [2]. - Same day: vomiting more than twice, diarrhea with blood, refusing all food for 24 hours, straining to urinate, a puppy with any of these signs, or a dog who seems painful. - Routine visit within a few days: mild appetite drop, low energy without other signs, or behavior changes that started after a stressful event. When in doubt, call. A phone call costs nothing, and veterinary staff would rather answer a question than treat a problem that got worse overnight. ## Frequently Asked Questions ### How long should I wait before calling the vet? Call the same day if your dog has refused food for a full day, vomited more than twice, or seems painful. Mild tiredness with a normal appetite can be watched for 12 to 24 hours. Any sign on the emergency list means call now, not later. ### Why is my dog shaking and drooling? Shaking and drooling together often point to nausea, pain, or exposure to something toxic. Fear and cold can also cause shaking. Because poisoning signs can appear fast or slowly, call your veterinarian or the Pet Poison Helpline if you suspect your dog ate something they should not have [2][7]. ### Is it safe to give my dog human medicine for nausea or pain? No. Several common human medications are toxic to dogs, and dosing is not the same as it is for people. Your veterinarian calculates any medication dose from your dog's weight and health status. Never give a human drug without veterinary direction. ### Can stress make my dog act sick? Yes. Stress can change appetite, energy, and behavior, and it produces measurable shifts in stress hormones [5]. Dogs in unstable or unpredictable environments are especially prone to these changes [6]. If physical signs like vomiting or diarrhea appear along with the behavior change, get a veterinary exam first. ### What should I bring to the appointment? Bring a written timeline of when signs started, how often they occur, and what your dog has eaten. Bring any medication bottles, including supplements. If you suspect poisoning, bring the packaging or a photo of the product. If your dog vomited or had diarrhea, a photo of it helps your veterinarian. ## Related Articles - [What to Do If Your Dog's Medication Is Causing Lethargy: When to Worry](/knowledge/veterinary-medicine/pet-medication-guide/what-to-do-if-your-dogs-medication-is-causing-lethargy-when-to-worry) - [Dog Dehydration Symptoms: How to Tell and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-dehydration-symptoms-how-to-tell) - [Dog UTI Symptoms: How to Recognize and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/dog-uti-symptoms-how-to-recognize) - [Dog Lethargy: How to Tell If It's Serious](/knowledge/veterinary-medicine/online-vet-and-care-costs/dog-lethargy-how-to-tell-serious) - [How Do I Know If My Dog Has Behavior Problems](/knowledge/veterinary-medicine/behavior/how-do-i-know-if-my-dog-has-behavior-problems) - [Dog Obstruction Symptoms](/knowledge/veterinary-medicine/symptom-guides/dog-obstruction-symptoms) ## References 1. [What Are Symptoms of Dog Being](https://www.petpoisonhelpline.com/uncategorized/what-are-symptoms-of-dog-being-poisoned/). Pet Poison Helpline. 2. [Dog Poisoning Symptoms](https://www.petpoisonhelpline.com/uncategorized/dog-poisoning-symptoms-what-are-they-and-how-to-treat-them/). Pet Poison Helpline. 3. [Assessment of acute and chronic pain in canine internal medicine-what is missing in our diagnostic toolbox?](https://pubmed.ncbi.nlm.nih.gov/41383971/). Frontiers in veterinary science, 2025. 4. [Ultrasound Features of Pancreatic Torsion in a Young Dog](https://pubmed.ncbi.nlm.nih.gov/42216735/). Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association, 2026. 5. [Stress in Free-Roaming and Shelter-Housed Dogs: A Review of Neurobiological, Physiological and Behavioral Mechanisms Relevant to Welfare Assessment](https://pubmed.ncbi.nlm.nih.gov/42511062/). Animals : an open access journal from MDPI, 2026. 6. [Welfare Under Transient Pressure: Rethinking Behavioral Assessments and Stress Mitigation for Shelter Dogs](https://pubmed.ncbi.nlm.nih.gov/42791675/). Animals : an open access journal from MDPI, 2026. 7. [What Are the Common Symptoms of Dog](https://www.petpoisonhelpline.com/uncategorized/what-are-the-common-symptoms-of-dog-poisoning/). Pet Poison Helpline. 8. [Accelerometry-Based Assessment of Overnight Coat Use on Dog Sleep and Activity Patterns: Implications for Farm Dog Welfare](https://pubmed.ncbi.nlm.nih.gov/42450742/). Animals : an open access journal from MDPI, 2026. 9. [Initial psychometric evaluation of the Korean version of the Canine Brief Pain Inventory for canine osteoarthritis](https://pubmed.ncbi.nlm.nih.gov/42551991/). Journal of veterinary science, 2026. ## Further Reading - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)