If your dog or cat has a procedure coming up, there’s a good chance the anaesthesia is what’s keeping you up at night, not the surgery itself. That’s completely normal. Many pet parents feel this way, and the questions we hear most often at our Keysborough veterinary practice are: Will my pet wake up? Is it safe for older animals? Who is watching them while they’re under?
This guide is here to explain what really happens when your pet goes under anaesthesia, so you can feel informed rather than anxious before the big day. With 73% of Australian households now owning at least one pet, these are questions vets across Melbourne answer every single day.
Why General Anaesthesia Is Necessary for Certain Procedures
Not every procedure needs general anaesthesia, but many do. Here’s the difference:
Sedation and general anaesthesia are both used in veterinary care to manage pain and anxiety during procedures, but they differ in intensity and application. Sedation helps reduce anxiety and keeps the pet calm while remaining conscious, making it suitable for minor procedures and certain imaging tests. In contrast, general anaesthesia induces complete unconsciousness along with full pain relief, and is typically used for more complex procedures such as surgeries, dental extractions, and orthopaedic work.
Key Points:
- Sedation
- Reduces anxiety and keeps the pet calm
- Pet remains conscious
- Used for minor procedures and some imaging
- General Anaesthesia
- Causes complete unconsciousness
- Provides full pain relief
- Used for surgery, dental extractions, and orthopaedic procedures
For procedures like dental care (including extractions), orthopaedic surgery, and abdominal surgery, pets need to be completely still. This isn’t just about comfort. A single flinch during a dental extraction or joint repair can cause serious harm. Restraint alone simply isn’t safe or humane for precise veterinary work.
General anaesthetic also ensures that your pet feels nothing throughout the procedure. Pain relief is built into the process, not an afterthought.
Pre-Anaesthetic Blood Tests and What We Check Before We Start
Before any anaesthesia for surgery at our Keysborough veterinary practice, we carry out a thorough pre-anaesthetic assessment. This is non-negotiable, and here’s why.
What the pre-anaesthetic blood work screens for:
- Liver function: The liver processes most anaesthetic agents. If it’s not working well, the drugs won’t clear from the body properly.
- Kidney function: Kidneys filter waste and maintain fluid balance. Impaired kidneys change which drugs we can safely use and at what dose.
- Red and white blood cell counts: These tell us about oxygen-carrying capacity and whether infection or inflammation is present.
- Blood glucose and protein levels: Especially important in older pets or those with known health conditions.
We also recommend pre-anaesthetic blood tests because they can pick up problems that aren’t obvious during a physical examination. A pet that looks healthy on the outside can still have early-stage organ function changes that affect how it responds to anaesthesia.
Alongside blood work, every pet receives a full physical examination and health history review before we proceed. We’ll ask about any medications your pet is on, any past reactions to anaesthesia, and any health condition you may have noticed at home. Please don’t hold anything back here. The more we know, the safer we can make the process.
Fasting: Your pet must not eat before the procedure. For most dogs and cats, this means no food from the night before. This reduces the risk of vomiting and inhaling stomach contents while under general anaesthetic, which can be life-threatening. Water rules vary, so always check with your vet.
What Happens in the Room: How Anaesthesia Is Administered and Monitored
Here’s a step-by-step breakdown of what happens when your pet goes under anaesthesia at our clinic.
Step 1: Pre-Medication
Going under is smoother and safer with injectable medications first. Before induction, pets are given pre-medication, usually a combination of calming agents and pain relief. This reduces anxiety, lowers the dose of induction agent needed, and makes the whole experience gentler for your pet. Your pet drifts off to sleep gradually rather than being plunged into unconsciousness.
Step 2: Induction
The induction agent is given directly into the vein, usually through a catheter placed in the foreleg. This brings your pet to full unconsciousness within seconds. We then place a breathing tube into their airway. This keeps their airway protected and allows us to provide oxygen and the anaesthetic gas continuously throughout the procedure.
Many pets can’t tolerate the strong smell of anaesthetic gas on its own, which is why going under this way, with injectable medications first, is far more comfortable.
Step 3: Maintenance
Once the breathing tube is in place, we maintain anaesthesia using inhaled anaesthetic gas (isoflurane or sevoflurane are most commonly used). The amount flows through the tube in a carefully controlled way, and our team adjusts it constantly. This allows us to fine-tune the depth of anaesthesia based on what’s happening in the procedure and how your pet is responding.
Step 4: Monitoring Throughout
This is where our dedicated veterinary nurse stays focused for the entire duration of your pet’s procedure. A dedicated veterinary nurse monitors your pet’s vital signs continuously using specialised equipment to track:
Monitoring vital parameters during anaesthesia is essential to ensure the safety and stability of the pet throughout the procedure. Key indicators such as heart rate and rhythm help detect early cardiac changes, while blood pressure ensures that vital organs are receiving adequate blood flow. Oxygen levels (SpO2) confirm that the blood is properly oxygenated, and breathing rate helps monitor for any signs of respiratory depression. Additionally, body temperature is closely observed because pets can lose heat quickly under anaesthesia, and anaesthetic depth is carefully adjusted to ensure the pet is neither too lightly nor too deeply anaesthetised.
Key Points:
-
- Heart Rate and Rhythm
Detects cardiac changes early - Blood Pressure
Ensures organs receive enough blood
- Heart Rate and Rhythm
- Oxygen Levels (SpO2)
Confirms proper oxygen supply in blood - Breathing Rate
Monitors respiratory depression - Body Temperature
Prevents heat loss during anaesthesia - Anaesthetic Depth
Ensures safe and appropriate sedation level
This level of continuous monitoring means we can respond quickly to even small changes before they become problems. Modern veterinary medicine makes this possible with equipment that was once only found in human hospitals.
Temperature management deserves a special mention. Pets lose body heat rapidly under anaesthesia. We use warming mats and heated air blankets throughout the procedure to keep your pet safe and stable. Without active warming, a pet’s core temperature can drop significantly, especially if large areas of the body are clipped or body cavities are opened.
Higher-Risk Patients: Older Pets, Flat-Faced Breeds, and Pets with Health Conditions
Age alone is not a reason to avoid anaesthesia. A senior dog or older cat can absolutely undergo a procedure safely, provided the protocol is tailored to your pet’s individual needs.
Patients who require modified protocols include:
- Older pets: Their organ function may be slower, requiring lower doses and more careful monitoring of vital signs.
- Brachycephalic breeds (flat-faced dogs and cats like French Bulldogs, Pugs, British Shorthairs): These breeds have narrower airways, making intubation and airway management more complex. Research confirms that brachycephalic breeds need extra airway care under anaesthesia, and vets should use breed information to have transparent discussions with owners before the procedure.
- Obese pets: Extra body weight affects drug distribution and increases the risk of breathing difficulties under anaesthesia.
- Pets with pre-existing conditions: Heart disease, diabetes, epilepsy, and other conditions all change how we approach the anaesthetic protocol.
The key point here is that we adjust. Every pet receives a plan tailored to your pet’s specific needs rather than a one-size-fits-all approach. Research published in 2024 confirms that careful patient evaluation, drug selection, and monitoring are all associated with reduced anaesthetic mortality in dogs and cats.
What puts a pet at greater risk is when owners don’t share important health information before the procedure. If you know your pet has a heart murmur, has had a reaction to medication, or has been unwell recently, please tell us. We’re not going to cancel the surgery for no reason. We’re going to make it safer.
Pet Dental Procedures and Anaesthesia: Why We Can’t Skip It
Pet dental work is one of the most common reasons dogs and cats come in for a general anaesthetic at our Melbourne clinic. We know many pet owners wonder why a clean or extraction can’t be done while the pet is awake.
Here’s why: a pet dental procedure involves probing below the gum line, using vibrating instruments, and sometimes drilling or extracting teeth. It’s uncomfortable, disorienting, and impossible to perform safely on a moving animal. Anaesthesia ensures your pet feels nothing, stays completely still, and is protected from inhaling water and debris.
The breathing tube placed during anaesthesia also keeps their airway protected and allows us to provide oxygen throughout the procedure, which is especially important during longer dental work.
Recovery: The First Hours After Anaesthesia
Once the procedure is done, the anaesthetic gas is turned off, and your pet begins to wake up. This doesn’t happen instantly, and it shouldn’t. Here’s what to expect:
At the clinic:
- Your pet is moved to a warm, quiet recovery area
- A veterinary nurse monitors your pet until they are awake, stable, and able to swallow
- Temperature is closely monitored and maintained
- Pain relief is given as needed before any discomfort sets in
What to expect when your pet comes home:
- Grogginess and uncoordinated movement for several hours
- Sleeping more than usual for the first 24 hours
- Reduced appetite (offer small amounts of food and water gradually)
- Some whimpering or vocalisation, which can be a normal response to the anaesthetic drugs
Most pets bounce back quickly. Within 24 to 48 hours, the majority of dogs and cats are back to their normal selves, especially after routine procedures.
Signs your pet needs attention: Call your vet immediately if you notice:
- Pale, white, or blue gums
- Laboured or noisy breathing
- Repeated vomiting
- Unable to stand or walk after several hours at home
- Extreme lethargy that isn’t improving
- Swelling, bleeding, or discharge at the surgical site
It’s also worth checking whether your pet insurance policies cover surgical procedures, anaesthesia, and post-operative care. Many do, so it’s a good idea to contact your provider before the procedure.
Common Questions to Ask Before Your Pet’s Procedure
Keysborough pet owners should feel completely comfortable asking questions before handing their pet over for surgery. Here are some good ones to start with:
- What pre-anaesthetic blood tests do you recommend for my pet?
- Who will monitor my pet during the procedure, and what equipment is used?
- How will you manage my pet’s body temperature during the procedure?
- What pain relief will my pet receive, and when?
- What is the recovery protocol at the clinic, and what should I watch for at home?
- When can I call to check in on my pet during the procedure?
No question is too small. The team at Keysvet is happy to answer every single one of them before the day.
Quick Reference: What Happens When Your Pet Goes Under Anaesthesia
The anaesthesia process in pets involves several carefully managed stages to ensure safety and comfort. It begins with a pre-assessment, including blood tests, a physical exam, and a review of the pet’s health history. Pre-medication is then given to provide calming and pain relief. During induction, an IV agent is used to bring the pet into unconsciousness, followed by intubation where a breathing tube is placed to protect the airway and deliver anaesthetic gas. Maintenance involves adjusting inhaled anaesthesia to keep the correct depth, while continuous monitoring tracks all vital signs. Finally, during recovery, the pet is kept in a warm environment under close observation until it gradually regains consciousness.
Book In and Talk to Us Before the Day
If your dog or cat has a procedure coming up and you want to know your pet is safe every step of the way, please give us a call before the day. The team at Keysvet, your trusted Keysborough veterinary practice, is happy to walk you through every part of the process.
Whether it’s desexing surgery, a dental procedure, or a more complex orthopaedic operation, we tailor every anaesthetic plan to ensure your pet receives the safest, most comfortable care possible. Give us a call and let’s make sure you feel confident and prepared before you bring your pet in.
Learn more about our surgical services | Pre-anaesthetic blood testing | Desexing your dog or cat
Frequently Asked Questions
Is pet anaesthesia safe?
Yes, when carried out by a trained veterinary team with proper monitoring equipment. Research shows that careful patient evaluation and monitoring are directly associated with better anaesthetic outcomes. The risk is very low for healthy pets undergoing planned procedures.
Do pets need blood tests before anaesthesia?
We also recommend pre-anaesthetic blood tests for all pets, especially older animals or those with any known health condition. These tests check organ function so we can tailor the anaesthetic protocol to your individual pet.
What does a veterinary nurse do during surgery?
A dedicated veterinary nurse stays with your pet throughout the entire procedure, continuously monitoring oxygen levels, heart rate, blood pressure, temperature, and anaesthetic depth using specialised equipment.
How long does it take for a pet to wake up after anaesthesia?
Most pets are awake within an hour of the gas being turned off, but may remain groggy for several hours. Pets bounce back quickly after routine procedures, with most being back to normal within 24 to 48 hours.
Can older pets safely go under anaesthesia?
Yes. Older pets can safely undergo anaesthesia when the protocol is carefully tailored to your pet’s health status. Pre-anaesthetic blood work and a thorough physical assessment are especially important in senior dogs and cats.
