Skip to Primary Content

Central Toronto Veterinary Referral Clinic

Sudden Illness & Urgent Decision‑Making in the Veterinary ER

Brown Dog Laying on Exam Table Surrounded by Veterinarians

Few moments are as frightening as when a pet who seemed fine hours ago suddenly becomes critically ill. One minute you’re planning your evening; the next, you’re rushing through the doors of an emergency veterinary hospital. In those first minutes and hours, pet owners are often asked to make fast, high‑stakes decisions—while worried, exhausted, and overwhelmed.

This post is meant to pull back the curtain on what happens in the veterinary ER and help you understand why decisions feel urgent, what information matters most, and how to navigate these moments with a little more clarity and confidence.

Why emergencies feel so sudden

Animals are remarkably good at hiding illness. Instinctively, many pets mask pain or weakness until their bodies can no longer compensate. When those coping mechanisms fail, decline can be rapid.

Common reasons pets present suddenly to the ER include:

  • Difficulty breathing

  • Collapse or profound weakness

  • Repeated vomiting or diarrhea

  • Severe pain or bloating

  • Seizures

  • Toxin exposure

  • Acute bleeding or trauma

  • Inability to urinate

To owners, it can feel like the illness came “out of nowhere.” Medically, it’s often the tipping point of a problem that has been quietly developing.

What happens first: triage

When you arrive at the ER, your pet is assessed immediately through triage—a rapid evaluation that determines how critical their condition is.

Pets with life‑threatening issues (trouble breathing, uncontrolled bleeding, collapse) are taken straight for stabilization. Others may wait , even if they look uncomfortable. This isn’t about who arrived first—it’s about who needs help right now to survive.

While this can be stressful to witness, triage ensures that the sickest patients get immediate care.

If your pet is triaged immediately to treatment room, you may be asked to leave an urgent care deposit. This step ensures the veterinarian can provide potentially life saving measures before speaking with you, making your pet the priority.

Why decisions are needed so quickly

In emergencies, time matters. Some conditions worsen by the minute, and early intervention can mean the difference between recovery and irreversible damage.

Veterinarians may ask you to make decisions about:

  • Emergency stabilization (oxygen, IV access, pain control)

  • Diagnostic testing (bloodwork, imaging)

  • Hospitalization or intensive care

  • Surgical intervention

Often, these decisions are made before a complete diagnosis is known. That uncertainty can feel uncomfortable, but in many cases treatment must start while we continue to gather information.

Understanding estimates and costs

One of the hardest parts of ER care is discussing finances during a crisis. Emergency hospitals typically provide estimates early because they need your consent to proceed.

A few important things to know:

  • Estimates are ranges, not exact totals—patients can improve or deteriorate

  • Early stabilization is prioritized before full diagnostics when possible

  • You will be kept up to date with your billing and may be presented with new estimates as the case unfolds

Clear communication helps the team tailor care to your pet and your situation. There are no “wrong” questions to ask. It is our job to present an estimate representing the best possible recommendations for care. We rely on you, the client, to be honest about any financial limitations, and once made aware of these, we can help to tailor the care as best we can to balance what your pet needs and what you can provide.

The emotional weight of urgent decisions

Making medical decisions under stress is incredibly hard. Many pet owners worry about making the “wrong” choice or fear being judged.

Please know:

  • Veterinarians understand how overwhelming this is

  • Recommendations are based on what gives your pet the best chance

  • Declining or limiting care does not mean you love your pet any less

Sometimes the kindest decision is aggressive treatment. Sometimes it’s euthanasia. Both are acts of love.

How to advocate for your pet (and yourself)

In the ER, it’s okay—and encouraged—to:

  • Ask for clarification in plain language

  • Request a moment to process information or consult with friends of family

  • Ask about prognosis with and without treatment

  • Share your pet’s personality, baseline health, and what matters most to you

You know your pet best. That information helps guide medical decisions.

What to bring to the ER

In an emergency, it’s okay if you arrive with very little—but if you’re able, the following can be helpful:

  • Any medical records you have, including recent bloodwork or imaging – we will not have access to any medical records or tests performed by your family veterinarian

  • A list of current medications and doses (photos on your phone work well)

  • Information about possible toxin exposure (plant names, medication bottles, foods)

  • Your primary veterinarian’s name and clinic

Most importantly, bring your pet as quickly and safely as you can. The ER team will help fill in the rest.

Frequently asked questions

Why can’t the vet tell me exactly what’s wrong right away?

Many emergencies present with similar symptoms. Stabilizing your pet often must happen before—or alongside—diagnostic testing. As more information becomes available, the treatment plan is refined.

Why do estimates change?

Your pet’s condition can evolve quickly. Some patients improve faster than expected; others need additional tests or treatments. Estimates reflect current recommendations and plans to the best of our knowledge.

Does choosing comfort care mean I’m giving up?

Not at all. Comfort‑focused care prioritizes quality of life and relief from pain or distress. For some pets and families, it is the most compassionate choice.