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What to Do When Your Pet is Acting Strange: Signs of Illness

October 17, 20246 min read

As pet owners, we know our pets better than anyone else. Whether it’s their playful energy, affectionate nature, or quirky habits, we recognize their typical behaviors. So when your pet starts acting strangely, it’s natural to be concerned. Unusual behavior could be an early warning sign of illness, and detecting these signs early is crucial for your pet's health and well-being.

In this blog, we’ll explore common signs of illness in pets, what to do when your pet is acting unusual, and how to know when it’s time to consult a veterinarian.


1. Common Signs of Illness in Pets

Pets can’t verbally tell us when they’re feeling unwell, but they often display physical and behavioral changes that indicate something is wrong. Recognizing these signs is key to catching illnesses early.

Changes in Appetite or Thirst

  • Increased or decreased appetite can be a sign of various health issues, including infections, dental problems, gastrointestinal disorders, or even more serious conditions like kidney disease or cancer.

  • Increased thirst (polydipsia) can indicate diabetes, kidney disease, or other health issues. If your pet suddenly starts drinking a lot more water than usual, it’s time to take notice.

Lethargy and Fatigue

If your normally active pet becomes lethargic or seems fatigued, this could indicate an underlying illness. Lethargy is often one of the earliest signs of illness in both dogs and cats and could point to anything from an infection to more serious conditions like heart disease or metabolic disorders.

Vomiting and Diarrhea

Occasional vomiting or diarrhea can happen from time to time, especially if your pet ate something that didn’t agree with them. However, persistent vomiting or diarrhea can be a sign of gastrointestinal issues, infections, or even poisoning. If these symptoms last for more than a day or are accompanied by other signs like lethargy or loss of appetite, it’s important to seek veterinary care.

Coughing, Sneezing, or Respiratory Problems

  • Coughing and sneezing in pets may signal respiratory infections, allergies, or heart disease.

  • Labored breathing or wheezing could indicate something more serious, like pneumonia or asthma (especially in cats).

Breathing problems in pets are always a cause for concern and should be addressed by a vet promptly.

Changes in Urination

Changes in urination patterns—whether it’s frequent urination, straining to urinate, or accidents in the house—can signal issues like urinary tract infections (UTIs), kidney disease, or bladder stones. In male cats, difficulty urinating can be a sign of a potentially life-threatening condition called a urinary blockage, which requires immediate veterinary attention.

Weight Changes

  • Unexplained weight loss or gain can indicate a range of health issues, including diabetes, thyroid problems, or digestive disorders.

  • Rapid or significant weight changes should never be ignored, especially if they occur without a change in your pet’s diet.

Behavioral Changes

Behavioral changes are often the first sign that something is wrong with your pet. Here are some changes to watch out for:

  • Increased aggression or irritability could signal pain or discomfort.

  • Withdrawal or hiding is particularly common in cats and may indicate that they are feeling unwell or stressed.

  • Excessive vocalization (barking, meowing, whining) can be a sign of pain, anxiety, or confusion, particularly in older pets who may be developing cognitive issues.

Skin and Coat Changes

  • Itching, excessive licking, or hair loss can be signs of skin infections, allergies, or parasites (like fleas or mites).

  • Dull or patchy fur can signal underlying health problems like poor nutrition, thyroid issues, or even metabolic disorders.

Limping or Difficulty Moving

Limping or stiffness, especially in older pets, can indicate arthritis or injuries. If your pet is having trouble moving or showing signs of pain when walking or jumping, it’s essential to have them checked out by a vet.

Bad Breath or Drooling

  • Bad breath (halitosis) is often a sign of dental disease, which can lead to serious health problems if left untreated.

  • Excessive drooling can also indicate dental problems, nausea, or even toxicity, depending on what your pet may have ingested.


2. What to Do When Your Pet is Acting Strange

When your pet starts acting differently, it’s important to assess the situation calmly and take appropriate steps to determine whether it’s a serious health concern.

Monitor Their Symptoms

The first step is to closely observe your pet’s behavior. Make note of the following:

  • How long the unusual behavior has been happening

  • Any additional symptoms (vomiting, diarrhea, lethargy, coughing, etc.)

  • Changes in eating, drinking, or bathroom habits

This information will be helpful if you need to consult your vet. Sometimes, mild changes in behavior can resolve on their own, but if symptoms persist for more than 24 hours or worsen, it’s time to seek professional help.

Check for Injuries or External Causes

If your pet is limping, shaking their head, or showing signs of discomfort, do a quick physical check for any obvious injuries, foreign objects, or swelling. Pets may act strangely if they’ve hurt themselves or have something stuck in their paw, fur, or ears.

For example, cats that suddenly start pawing at their mouth may have something lodged in their teeth, while dogs who are shaking their heads might have ear infections or mites.

Evaluate Their Environment

Consider whether any recent changes in your home could be causing your pet stress. New furniture, guests, or even changes in your schedule can affect your pet’s behavior. Stress or anxiety can cause them to act out in ways that mimic illness, like refusing food or hiding.


3. When to See the Vet

While some behavioral changes may resolve with time, it’s important to know when professional veterinary care is necessary. Here are some clear signs it’s time to call the vet:

Persistent Symptoms

If your pet’s strange behavior persists for more than a day or two, especially if accompanied by other symptoms like vomiting, diarrhea, lethargy, or coughing, it’s best to consult your vet.

Sudden, Severe Symptoms

If your pet exhibits any of the following signs, seek veterinary care immediately:

  • Difficulty breathing

  • Continuous vomiting or diarrhea

  • Seizures

  • Inability to stand or walk

  • Signs of pain (whining, yelping, restlessness)

  • Bloated abdomen (could indicate a serious condition called gastric dilatation-volvulus in dogs)

Emergency Situations

Certain situations are true emergencies, and you should get your pet to a vet as soon as possible. These include:

  • Ingestion of toxic substances (like chocolate, certain plants, or medications)

  • Severe injuries (broken bones, open wounds)

  • Difficulty urinating or defecating (especially in male cats)


4. Preventative Care to Keep Your Pet Healthy

The best way to ensure your pet’s long-term health is through regular veterinary check-ups and preventative care. This includes:

  • Routine vaccinations

  • Flea, tick, and heartworm prevention

  • Regular dental cleanings

  • Annual physical exams to detect any early signs of illness

Preventative care helps catch health issues early, ensuring your pet receives the treatment they need before a condition worsens.


When your pet starts acting strange, it’s often their way of telling you that something’s wrong. By paying attention to unusual behaviors and physical signs, you can catch potential health issues early and get your pet the care they need. Always trust your instincts as a pet owner—if something doesn’t seem right, don’t hesitate to consult your veterinarian.

Remember, early intervention can make all the difference in your pet’s health and happiness!

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