Cats are built to hide weakness. That evolved trait protects them from predators in the wild, and costs them dearly in domestic life, because most "he's just been quiet today" turns out to be a week of disease the cat hid successfully.
If any of the following signs show up, don't wait for business hours. Call the emergency vet and go.
The absolute emergencies (go now)
1. A male cat straining to pee
The single most common life-threatening cat emergency. A urethral blockage in a male cat is fatal within 24–48 hours. Signs:
- In and out of the litter box repeatedly
- Producing little or no urine
- Crying or howling in the box
- Licking the genital area excessively
- Vomiting
Go immediately. Not in an hour. Not tomorrow. The longer you wait, the higher the chance of kidney failure or death.
2. Labored or open-mouth breathing
Cats almost never breathe through their mouths. Panting, wheezing, or visible effort to breathe means an emergency:
- Heart failure
- Asthma attack
- Fluid in the chest
- Pneumonia
- Heat stroke
- Poisoning
Count the breaths. Over 40 breaths per minute at rest is abnormal.
3. Collapse, severe weakness, or inability to use back legs
Especially with cold back feet. This is a classic sign of saddle thrombus (aortic thromboembolism), a blood clot that lodges in the blood vessel to the rear legs. Extremely painful and serious.
4. Extended seizures or repeated seizures
A single short seizure (under 2 minutes) is still a same-day vet visit. A seizure longer than 5 minutes, or multiple seizures back-to-back, is an ER trip.
5. Known or suspected poisoning
Common cat poisons:
- Lilies, all parts, all types, a tiny amount can cause kidney failure
- Acetaminophen (Tylenol), fatal from a single adult dose
- Antifreeze, sweet-tasting, fatal in tiny amounts
- Essential oils, tea tree, pennyroyal, wintergreen, and others
- Rodenticide
- Human ADHD medication or antidepressants
If you know or strongly suspect, call ASPCA Animal Poison Control (888-426-4435, fee applies) on the way to the vet.
6. Major trauma
- Hit by car
- Fall from a height (even a cat who "landed fine")
- Dog attack or fight with another animal
- Caught in a door
Internal injuries can be invisible for hours. Always worth a vet check.
7. Profuse bleeding
Bleeding that doesn't stop with 5 minutes of direct pressure.
8. Severe vomiting or diarrhea
- Blood in either
- Repeated vomiting (more than 3 times in a few hours)
- Diarrhea lasting more than 24 hours in an adult cat (much less in kittens, they dehydrate fast)
- Vomiting combined with lethargy
9. Not eating for more than 24 hours
This is specific to cats, hepatic lipidosis (fatty liver) can develop rapidly in a cat who stops eating, especially if they're overweight. It's life-threatening.
If an adult cat hasn't eaten anything in 24 hours, call your vet. If a kitten hasn't eaten in 12, same.
10. Suspected foreign body
- String, yarn, ribbon, dental floss hanging from mouth or rear end do not pull it. A linear foreign body can saw through the intestinal wall. Go to the ER.
- Any swallowed hard object
11. Eye injuries
Cats' eyes deteriorate fast. A squinting, painful, or bleeding eye is a same-day visit, often same-hour, to prevent permanent vision loss.
12. High fever
Normal cat body temperature is 100.5–102.5°F. Over 104°F is an emergency. Cats overheat fast in enclosed cars and small apartments in summer.
The "same-day but not ER" signs
Worth a regular vet call today, just don't stuff them in the overnight bag:
- Not drinking water for 24+ hours
- Mild lethargy with no other symptoms
- One or two vomits with no other signs
- Diarrhea for less than 24 hours, otherwise normal
- Limping but still weight-bearing
- Missing a meal or two but otherwise normal
- Small superficial wounds
Things that feel urgent but usually aren't
- A single hairball every 2–4 weeks
- Sneezing once or twice
- One skipped meal in an otherwise normal adult cat
- Mild, occasional scratching
- Brief, small vocalizations (yowling once)
Prepare before it happens
Know your nearest emergency vet
Bookmark the address and phone now, not at 2am. Ideally know two:
- Your primary emergency clinic
- A backup 24-hour hospital within driving distance
Keep a carrier accessible
Not in the basement. Not in a closet stacked with holiday boxes. Keep it where you can grab it in 30 seconds. Many cat parents leave the carrier out all the time as a cat bed, which also reduces carrier stress.
Have a transportation plan
Does your neighbor have a car? Can you Uber or Lyft Pet? Know this before the 3am emergency.
Know your cat's baseline
- Normal resting breathing rate
- Typical daily eating and drinking
- Usual energy level
- Normal gum color (pink, moist)
Deviations are easier to spot when you know the baseline.
Pet insurance or an emergency fund
Average cat ER visit: $1,500–$3,500. Surgery for a blockage or foreign body: $3,000–$7,000+. Plan for it, either insurance or a dedicated savings cushion.
The rule of thumb
If you're asking yourself "should I take them in?" the answer is usually yes. Cats are so good at hiding illness that the "obvious" sign is often the tip of a much bigger iceberg. A $150 urgent-care visit that turns out to be nothing is always cheaper than waiting.
Trust your gut. You know your cat.