Common Signs Your Pet May Need a Vet

Pets cannot explain pain, nausea, breathing trouble, dizziness, urinary pain, or weakness in words. Instead, they show changes in appetite, movement, breathing, litter box habits, energy, behaviour, gums, eyes, skin, and bathroom routine.

Some signs mean “watch closely and book a vet appointment.” Other signs mean “do not wait.” The safest approach is to look at the whole picture: what changed, how suddenly it happened, how severe it looks, and whether your pet is eating, drinking, breathing, peeing, pooping, walking, and responding normally.

This guide separates common pet warning signs into practical groups, so you know when a problem may be urgent and when it still deserves a vet check soon.

Emergency signs: contact a vet immediately

The signs below can be serious or life-threatening. Call your vet, an emergency clinic, or animal poison control right away.

Go urgently if your pet has:

difficulty breathing, gasping, choking, noisy breathing, or open-mouth breathing in a cat
blue, grey, white, purple, or very pale gums
collapse, fainting, extreme weakness, or being unresponsive
a seizure lasting more than a few minutes, or repeated seizures
suspected poisoning, including human medication, toxic foods, chemicals, plants, or rodent poison
severe bleeding or bleeding that does not stop with firm pressure
major trauma, such as being hit by a car, falling from a height, or an animal attack
a swollen, hard, painful belly, especially with retching but no vomit
repeated vomiting or severe diarrhea, especially with blood, weakness, or dehydration
trouble peeing, straining to pee, crying in the litter box, or producing little/no urine
eye injury, bulging eye, severe squinting, cloudiness, or something stuck in the eye
heatstroke signs such as heavy panting, weakness, collapse, vomiting, or seizures after heat exposure
extreme pain, constant crying, shaking, or sudden inability to walk

Do not wait to see if these signs “go away.” Some emergencies look mild at first and then become dangerous quickly.

Signs that may need a same-day vet call

These signs may not always be an emergency, but they are important enough that you should call a vet the same day for advice.

Sign	Why it matters	What to do
Not eating	Appetite loss can happen with pain, fever, nausea, dental disease, infection, stress, or serious illness.	Call sooner for kittens, puppies, seniors, small pets, or pets with known illness.
Repeated vomiting	Can lead to dehydration and may be linked to infection, toxins, obstruction, pancreatitis, or other problems.	Call urgently if repeated, bloody, severe, or paired with weakness.
Diarrhea	Can cause dehydration, especially in young, old, or small animals.	Call the vet if severe, bloody, watery, frequent, or lasting more than a short time.
Coughing or breathing changes	Can be linked to airway, heart, lung, infection, allergy, or pain problems.	Urgent if breathing is hard, fast, noisy, or your pet seems distressed.
Straining to pee	Can be very serious, especially in male cats.	Call immediately if little or no urine comes out.
Sudden severe pain	Pain may come from injury, urinary problems, abdomen problems, dental disease, or other illness.	Do not give human pain medicine. Call a vet.

Signs that need a vet appointment soon

Not every problem is an emergency. But small changes can still be important, especially if they continue, repeat, or get worse.

Book a vet appointment if you notice:

weight loss or weight gain without a clear reason
eating much less or much more than usual
drinking much more water than usual
peeing much more or much less than usual
bad breath, drooling, pawing at the mouth, or difficulty chewing
limping, stiffness, trouble jumping, or reluctance to climb stairs
scratching, hair loss, scabs, redness, or skin smell
head shaking, ear smell, ear discharge, or ear scratching
eye redness, discharge, squinting, or cloudiness
coughing, sneezing, or nasal discharge that does not settle
new lumps, bumps, swelling, or wounds
sudden hiding, aggression, confusion, clinginess, or behaviour change
changes in poop, litter box habits, or accidents in the house
low energy that does not match your pet’s normal routine

Breathing problems are urgent

Breathing trouble is one of the clearest reasons to seek urgent veterinary help. Pets may show breathing distress in different ways.

Warning signs include:

gasping for air
open-mouth breathing in a cat
panting in a cat
blue, grey, purple, white, or very pale gums
breathing that looks hard, fast, noisy, or strained
neck stretched forward while breathing
belly moving strongly with each breath
collapse or weakness with breathing changes

Do not force food, water, or medicine into a pet who is struggling to breathe. Keep them calm, reduce handling, and go to emergency care.

Vomiting and diarrhea: when to worry

One mild stomach upset may not always mean an emergency. But vomiting and diarrhea become more concerning when they are repeated, severe, bloody, or paired with weakness.

Call a vet quickly if your pet has:

vomiting many times in a short period
vomiting plus diarrhea
blood in vomit or stool
black, tar-like stool
watery diarrhea in a puppy, kitten, senior, or very small pet
vomiting after eating bones, toys, string, fabric, or rubbish
vomiting after possible toxin exposure
vomiting or diarrhea with weakness, collapse, fever, pain, or dehydration

Do not give human stomach medicine unless a vet specifically tells you to. Some human medicines are unsafe for pets.

Peeing problems can become dangerous

Urinary problems should not be ignored. This is especially important for cats, because a urinary blockage can become life-threatening.

Get urgent help if you see:

repeated trips to the litter box with little or no urine
straining to pee
crying while trying to pee
blood in urine
licking the urinary area repeatedly
vomiting, weakness, or hiding with urinary signs
a male cat who seems blocked or cannot pee

Do not wait overnight if your pet is trying to pee but little or nothing comes out. Call a vet or emergency clinic.

Pain, limping, and movement changes

Pets often hide pain. Pain may look like limping, shaking, hiding, aggression, restlessness, crying, stiffness, or not wanting to be touched.

Signs of pain may include:

limping or not using a leg
trouble standing, jumping, or climbing stairs
crying, whining, growling, or hissing when touched
shaking, trembling, or hiding
restlessness or not being able to get comfortable
licking one area again and again
sudden aggression or fear
arched back, tucked belly, or stiff posture

Do not give ibuprofen, paracetamol/acetaminophen, aspirin, or other human pain medicine unless your vet specifically prescribes it. Some human pain medicines can be toxic to pets.

Eating, drinking, and weight changes

Changes in appetite, thirst, or weight can be early signs of illness. These changes are easy to miss if they happen slowly.

Change	Why it matters	Vet timing
Not eating	May happen with pain, fever, dental disease, nausea, stress, or serious illness.	Same-day call for cats, kittens, puppies, seniors, or sick pets.
Drinking much more	Can be linked to kidney disease, diabetes, infection, medication effects, or other issues.	Book a vet appointment soon.
Losing weight	Can happen with dental disease, parasites, thyroid disease, kidney disease, cancer, or chronic illness.	Book a vet appointment soon.
Sudden bloating	A swollen hard belly can be urgent, especially with pain, weakness, or retching.	Emergency if sudden, hard, painful, or paired with retching.

Skin, ears, eyes, and mouth signs

Skin, ear, eye, and mouth problems may not always be emergencies, but they can become painful and should not be ignored.

Book a vet check for:

red, itchy, flaky, smelly, or painful skin
hair loss, scabs, hot spots, wounds, or swelling
ear smell, discharge, head shaking, or scratching
eye redness, discharge, cloudiness, squinting, or swelling
bad breath, drooling, bleeding gums, broken teeth, or trouble chewing
lumps that are growing, bleeding, painful, or changing shape

Eye injuries need urgent care

If your pet has a visible eye injury, sudden blindness, a bulging eye, severe squinting, or something stuck in the eye, contact a vet quickly.

Special care for puppies, kittens, seniors, and sick pets

Young, old, pregnant, very small, or already sick pets can become unwell faster. Do not wait as long with these pets.

Call sooner if the pet is:

a kitten or puppy
a senior pet
pregnant or nursing
very small or underweight
already diagnosed with heart, kidney, liver, breathing, urinary, or immune disease
not vaccinated
recovering from surgery or injury

What to tell the vet when you call

Clear information helps the clinic decide how urgent the situation is.

Your pet’s species, age, breed, and weight.

The main symptom you noticed.

When it started.

Whether it is getting worse.

Eating and drinking changes.

Peeing and pooping changes.

Vomiting, diarrhea, coughing, or breathing changes.

Possible toxin, medicine, plant, food, or injury exposure.

Any current medication or known illness.

Photos or videos of the symptom if safe to take.

Common mistakes to avoid

waiting overnight when a pet cannot pee
waiting to see if breathing trouble improves
giving human medicine without a vet
forcing food or water into a pet who is weak or struggling to breathe
inducing vomiting after poisoning unless a vet or poison control tells you to
assuming cats are fine because they are quiet
ignoring pale, blue, grey, purple, or white gums
ignoring repeated vomiting or diarrhea in kittens, puppies, seniors, or sick pets
cleaning a deep wound and waiting instead of calling a vet
using home remedies for serious symptoms

Quick vet-check checklist

Is your pet breathing normally?

Are the gums pink, not pale, blue, grey, purple, or white?

Can your pet stand and respond normally?

Is your pet eating and drinking?

Is your pet peeing normally?

Is there vomiting or diarrhea?

Is there blood, swelling, injury, or severe pain?

Could your pet have eaten something toxic?

Has behaviour changed suddenly?

Would you feel safer speaking to a vet?

Final thoughts

You do not need to diagnose your pet at home. Your job is to notice changes early, take urgent signs seriously, and contact a vet when something feels wrong.

The most important red flags are breathing trouble, collapse, seizures, suspected poisoning, severe bleeding, repeated vomiting or diarrhea with weakness, a swollen hard belly, eye injury, and trouble urinating.

When you are unsure, call the vet. A quick call can help you decide whether your pet needs emergency care, a same-day appointment, or a routine check.

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Common Signs Your Pet May Need a Vet

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