Late at night, phone in hand, googling your dog's symptoms and cycling through results that range from "totally normal" to "may be fatal within hours." This is a well-worn experience for most pet owners. The internet is not useless, but it has a consistent weakness: it cannot triage. It cannot tell you whether the thing you are looking at needs an ER visit tonight or a wait-and-see approach through the morning.
This article is a cleaner framework for that. Twelve signs, organized by what they actually require from you.
In this article:
- Signs you can monitor at home
- Signs that need a scheduled vet visit
- Signs that need emergency care right now
- Keeping records that help your vet help you
- Frequently asked questions
Signs You Can Monitor at Home
These situations do not require immediate action, but they deserve attention. If they resolve within 24 to 48 hours, fine. If they persist or worsen, move them to the next tier.
1. A Single Episode of Vomiting
One vomit, no blood, no distress, followed by normal behavior and willingness to drink water. In a dog that ate grass, ate too fast, or got into something mild, this is common and usually self-resolving. Withhold food for two to four hours, offer small amounts of water, and observe.
The concern threshold goes up with frequency. Two or more episodes in a few hours, any blood, or a dog that retches repeatedly without producing anything are different situations entirely.
2. Mildly Soft Stools After a Diet Change or Stressful Event
A single bout of loose stool tied to an obvious cause, like switching foods, travel, a new household member, or boarding, can usually be watched. Offer bland food (plain boiled chicken and white rice is the standard), ensure the pet stays hydrated, and monitor for 24 to 48 hours.
If there is blood in the stool, the diarrhea continues past two days, or your pet seems lethargic or refuses water, that changes the calculus.
3. A Skipped Meal With No Other Symptoms
Dogs occasionally skip a meal without anything being wrong. A hot day, excitement, a slight stomach upset, or finicky behavior around a new food can all cause it. If your dog misses one meal, acts normally otherwise, drinks water, and eats the next time you offer food, you have nothing urgent to investigate.
Cats are a different story. Even one significantly reduced meal in a cat, especially an overweight one, is worth monitoring more closely. If a cat skips food for 12 hours or more, contact your vet.
4. A Minor Limping That Resolves Quickly
A dog that limps briefly after waking from a long nap, or after an unusually active day, and returns to normal movement within an hour or two is often just stiff or mildly sore. Watch for recurrence. Watch for favoring the leg consistently. Watch for any swelling or sensitivity when you gently handle the area.
If the limping does not improve within 24 hours, worsens, or your pet refuses to bear weight at all, it needs a vet visit.
Signs That Need a Scheduled Vet Appointment
These do not require a middle-of-the-night emergency clinic visit, but they should not sit on a waiting list for three weeks either. Call your vet and get an appointment within a few days.
5. Significant Loss of Appetite Lasting More Than 24 Hours
A dog that has skipped two consecutive meals, or a cat that has been eating noticeably less for a day or more, needs to be seen. Reduced appetite is one of the most non-specific signs in medicine, which means it can indicate dozens of things. That is exactly the reason it needs investigation rather than home management.
For cats, the concern is hepatic lipidosis. A cat that stops eating, particularly an overweight cat, can develop this life-threatening liver condition within days. Do not wait.
6. Noticeably Increased Thirst
If your dog or cat has been at the water bowl far more frequently than usual, without an obvious explanation like hot weather or extra exercise, that change is worth discussing with your vet. Increased thirst is a common early sign of diabetes, kidney disease, hyperthyroidism in cats, or Cushing's disease in dogs. None of these announce themselves loudly in the early stages. A blood panel and urinalysis will tell you what you need to know.
7. A New Lump or a Changing Existing One
Find a new lump on your pet? Book an appointment. Do not wait to see if it grows. Do not search "dog lump looks like" and try to match it to photos. A veterinarian can perform a fine needle aspirate in about two minutes at a routine visit, and it provides a meaningful first answer about what the lump is made of. A lipoma (benign fatty tumor) and an early mast cell tumor feel identical by hand. You cannot tell the difference yourself.
New lumps found early are almost always more manageable than the same lumps found months later.
8. Recurring Skin, Ear, or Eye Issues
A dog that has had three ear infections in six months does not have bad luck. It has an underlying cause that has not been identified yet. Recurrent skin infections, chronic paw licking, persistent eye discharge, and recurring hot spots all follow the same pattern. Each individual episode can be treated, but the underlying trigger (often environmental allergy, food allergy, or hormonal imbalance) is what needs to be found and addressed. A vet visit focused on the pattern rather than just the current flare-up moves the situation forward.
Signs That Need Emergency Care Right Now
These are not "call your vet in the morning" situations. They require going to an emergency clinic immediately. If your regular vet is closed, find your nearest 24-hour emergency veterinary facility now and save the number before you need it.
9. Labored Breathing or Open-Mouth Breathing in a Cat
Cats breathe through their nose. Open-mouth breathing in a cat at rest, breathing with visible effort, or breathing with the elbows pushed out and neck extended are all emergency presentations. Respiratory distress can deteriorate very quickly. Go now.
Dogs can pant heavily after exercise, in heat, or when anxious, but a dog breathing with obvious effort at rest, with gums that appear pale, blue, or gray, needs emergency care.
10. Seizures
A first-time seizure, a seizure lasting more than two minutes, or multiple seizures within a 24-hour period (called cluster seizures) all require emergency evaluation. While some causes of seizures are manageable once identified, a first seizure needs to be worked up immediately. A dog or cat experiencing a seizure should not be restrained. Keep them away from furniture they could injure themselves on and stay calm.
11. Suspected Ingestion of Something Toxic
If you know or have strong reason to suspect your pet has eaten something toxic, do not wait for symptoms to appear. By the time symptoms are obvious, a significant amount of time has often passed.
Call the ASPCA Animal Poison Control Center at (888) 426-4435 on the way to the clinic. They operate 24 hours a day, 365 days a year, and a toxicologist will tell you exactly how urgent the situation is based on the substance, the dose, and your pet's size. The consultation has a fee, but the guidance is specific and worth it.
Common household toxins that cause emergencies: xylitol (found in some peanut butters, sugar-free gum, and certain vitamins), grapes and raisins, rat or mouse poison, macadamia nuts, onions and garlic in significant quantities, and many over-the-counter pain medications including ibuprofen and acetaminophen.
12. Inability to Urinate, Collapse, Uncontrolled Bleeding, or Sudden Inability to Walk
Any of these is go-now territory.
A male cat straining in the litter box without producing urine has a urinary blockage, which is fatal within hours if not treated. A dog that collapses, even briefly, needs same-day emergency evaluation. Uncontrolled bleeding that does not slow after several minutes of direct pressure needs a vet. Sudden paralysis or inability to bear weight, especially in dogs with long spines (Dachshunds, Corgis), can indicate a spinal emergency where time to treatment matters significantly.
Keeping Records That Help Your Vet Help You
One of the most useful things you can do for your pet's health has nothing to do with a specific symptom. It is keeping a running record of what is normal for your pet, and documenting when things change.
When you call your vet and can say "he has had reduced appetite for three days, his water intake roughly doubled, and this morning he seemed reluctant to go up the stairs," you are giving the clinic specific, timed information that meaningfully helps them prepare for the visit and prioritize correctly. "He just seems off" is hard to act on.
The Vet Visit Record template gives you a single-page log for each visit, including current medications, recent symptoms, and anything the vet found. Keep one per pet and bring it to every appointment. The Pet Emergency Info Sheet puts your pet's critical information (medications, conditions, vet contacts, insurance details) on a single page that you or any caregiver can hand to an emergency clinic without having to recall anything from memory under stress.
These two documents together take about 20 minutes to set up and are worth having well before you ever need them.
Frequently Asked Questions
My dog seems fine after eating something potentially toxic. Can I just monitor at home?
No. Many toxins have a delayed onset, and by the time symptoms appear, significant damage may have already occurred. Xylitol causes blood sugar crashes and liver failure in dogs, and symptoms can develop hours after ingestion. Rat poison interferes with clotting and may not show signs for several days. Call the ASPCA Poison Control line immediately and follow their guidance rather than waiting to see how your pet does.
What does a cat in pain actually look like?
Cats are remarkably good at hiding pain. Signs tend to be behavioral and subtle: reduced grooming (a cat with a unkempt coat who was previously fastidious), avoiding the litter box because stepping in hurts, not jumping to usual perches, hiding more than usual, reduced appetite, and a faint squinting or narrowing of the eyes. A cat that is vocalizing loudly in obvious distress is actually showing advanced pain. Quiet, withdrawn behavior is often the earlier signal.
My vet cannot see my pet for two weeks. What do I do if I think they need to be seen sooner?
Call and explain the symptoms specifically rather than booking a standard appointment. Most clinics keep same-day urgent slots for situations that do not rise to an emergency but should not wait two weeks. If the clinic genuinely cannot accommodate you, ask if they can advise over the phone or provide a referral. If you believe the situation is urgent and you cannot get a same-day appointment, an emergency clinic is the right option even for non-critical issues.
How do I know whether to call the regular vet or go straight to emergency?
If it is within regular clinic hours and the situation is not one of the emergency signs listed above, call your regular vet first. They know your pet's history. If it is after hours or your regular vet cannot fit you in and you are concerned, the emergency clinic is the right call. When in doubt, call the emergency clinic and describe the symptoms. They will tell you whether to come in immediately. They do this all day and are not bothered by the question.
What should I bring to an emergency vet visit?
Bring any medication your pet is currently taking (or a clear written list with doses), your pet's vaccination history if you have it, and any information about what they may have eaten or been exposed to. If your pet has a chronic condition, any records you have are helpful. If you do not have paperwork, go anyway. The emergency clinic can work without records; having them just makes care faster and more precise.