Anaesthesia for senior dogs and cats:can older pets have dental treatment?

Can an old dog or cat have anaesthesia?

Yes — provided the pet's health has been assessed and the preparation is thorough. The anaesthetist grades the patient's physical status on the ASA scale, and that grade depends on the presence and severity of disease, not on the date of birth. So a clinically healthy 15-year-old cat may carry a lower anaesthetic risk than a younger cat with untreated heart disease.

Age is not ignored, though. Over the years the body's reserves shrink: the heart, kidneys and liver cope less well with stress, the pet loses heat faster and drugs may act for longer. So age is taken into account when planning — in drug doses, the level of monitoring, warming and the length of the procedure — but it is not a verdict.

“Senior” is a relative term. Large-breed dogs age earlier than small ones, and 15 is already a venerable age for a cat. That is why I look not at the number in the passport but at how the pet is doing, which chronic conditions it has and what the tests show.

What delaying dental treatment means for an older pet

Fear of anaesthesia is understandable, but declining treatment is also a decision with consequences. Dental disease does not go away on its own, and older pets usually accumulate more of it: periodontal disease, fractured teeth, tooth resorption (TR) in cats, root abscesses. Without treatment this means:

• chronic pain — pets hide it and keep eating, so owners may not suspect a problem (why pets keep eating despite painful teeth);
• ongoing infection — pus in periodontal pockets, abscesses, draining tracts, swelling under the eye;
• weight loss — when biting into food hurts, the pet eats less or picks at its food, loses weight and loses muscle;
• progressing disease — teeth lose their bony support, and in small dogs severe periodontal disease can weaken the lower jaw so much that it breaks under minimal force;
• poorer quality of life — the pet sleeps more, plays less, a cat grooms less, and all of it is easy to put down to “old age”.

There is one more argument. If treatment is put off for a year or two, the amount of work usually grows — and with it the length of the anaesthetic. By then the pet will be older still and may have more underlying conditions. So we make the decision together, weighing the risk of anaesthesia against the risk of living with pain and infection.

Which tests an older pet needs before anaesthesia

The aim of testing is not to “get clearance for anaesthesia” but to understand how this particular pet's body works and to fit the plan to it. The AAHA Anesthesia and Monitoring Guidelines recommend choosing tests individually — based on the history, the examination and the planned procedure. For an older patient this usually means:

• history — chronic conditions, all medicines and supplements, previous anaesthetics and how the pet coped with them;
• clinical examination — listening to the heart and lungs, the colour of the mucous membranes, weight and body condition;
• complete blood count and biochemistry — these show kidney and liver function, glucose and protein levels, and signs of anaemia or inflammation;
• when clinically indicated — echocardiography (heart ultrasound), blood pressure measurement, urinalysis, thyroid hormones in cats, abdominal ultrasound, chest X-rays.

For example, if a dog has a heart murmur or a cat has an abnormal heart rhythm, assessing the heart becomes an important part of preparation — in cats, heart disease can go without outward signs for a long time. Changes in kidney values will shape the fluid plan and the choice of pain relief after the procedure. If a cardiologist or internal medicine vet already follows your pet, bring their reports: they help the anaesthetist a great deal.

The tests can be done at your own clinic and the results sent in advance. I discuss the exact list with the owner at an in-clinic or online consultation.

Heart, kidneys, endocrine disease: why the plan is always individual

Older dogs and cats quite often have one or more chronic conditions. Each one changes the anaesthetic plan in its own way:

• Heart disease. Small-breed dogs quite often develop a murmur with age because of changes in the mitral valve, and in cats cardiomyopathy can go without outward signs for a long time. The anaesthetist takes this into account when choosing drugs and fluid volumes, because excess fluid puts strain on a diseased heart.
• Chronic kidney disease. During anaesthesia it is important to maintain blood pressure and blood flow to the kidneys, and to choose pain relief after the procedure with kidney function in mind.
• Hyperthyroidism in cats. Excess thyroid hormone speeds up the heart and can raise blood pressure, so the condition may need to be stabilised with treatment before a planned procedure.
• Diabetes mellitus. Fasting, the insulin dose on the day and glucose checks during anaesthesia are agreed individually.
• Other endocrine diseases in dogs — hypothyroidism or hyperadrenocorticism (Cushing's disease) — are also taken into account, especially if they are not yet controlled with treatment.
• Arthritis and muscle weakness. The pet is moved gently, given soft padding and a well-thought-out pain relief plan, so that standing up and walking after the procedure is comfortable.

If a condition is not under control, a planned anaesthetic is usually postponed until it is stabilised — that is not a refusal to treat but part of the preparation. It is different with an abscess, an injury or severe pain: then we weigh what the pet risks by waiting and choose the safest option under those circumstances.

How the risk is reduced during anaesthesia

The AAHA guidelines describe anaesthesia as a continuous process — from the initial assessment to full recovery. For an older patient every stage matters:

• A separate veterinary anaesthetist. I work in the mouth, while the anaesthetist watches only the patient the whole time, adjusts the depth of anaesthesia and responds to changes.
• Inhalational anaesthesia with intubation. A tube in the windpipe protects the airway from water, plaque and blood, and the depth of anaesthesia can be adjusted quickly.
• Continuous monitoring — breathing, heart rhythm, blood oxygen saturation, blood pressure and temperature.
• Local dental nerve blocks. They block pain in the treatment area and can reduce the amount of inhalational anaesthetic needed — and with it its effect on blood pressure and the heart.
• Warming. Older pets lose heat faster, and low body temperature slows recovery, so they are kept warm from the start to the end of the procedure.
• Intravenous fluids. Fluids given through an intravenous catheter support blood pressure and circulation; the volume and rate are calculated with heart and kidney function in mind.
• Careful recovery. The anaesthetist stays with the patient until recovery is stable and keeps pain under control — this period needs no less attention than the procedure itself.

More about the approach to anaesthesia, monitoring and local blocks is on the “Anaesthesia and safety” page.

Dental cleaning for an old dog under anaesthesia: one planned anaesthetic instead of several

For an older pet it is especially important that every anaesthetic achieves as much as possible. That is why I do not plan just a “dental clean” but a full COHAT: examination and periodontal probing of every tooth, full-mouth dental radiography and treatment of whatever we find — at the same visit.

Without radiographs, much of the disease stays invisible: a fractured root, an abscess or bone loss hide below the gum line. If only the visible tartar is removed, a diseased tooth may cause trouble again within months — and another anaesthetic will be needed.

Before the procedure we agree on what to do if the radiographs show more problems than expected — so that I can contact you and not postpone necessary treatment. At the same time, it is sometimes safer to split a large amount of work into two stages. We make that decision together with the anaesthetist, based on how the pet is doing during the procedure.

So-called “anaesthesia-free dental cleaning” is not a gentler option for an older pet: it does not allow the teeth to be examined below the gum line and does not treat the cause of pain.

How to prepare an older pet for the procedure

Preparation starts well before the day of the procedure. Here is what you can do:

• gather previous test results, discharge notes and other vets' reports;
• make a list of all medicines and supplements with doses and times;
• recall how your pet coped with previous anaesthetics and whether there were complications;
• tell us about changes in recent months: drinking or urinating more, weight loss, coughing, tiring quickly, fainting episodes;
• follow the individual instructions on fasting, water and morning medication — for older pets, especially those with diabetes or kidney disease, they may differ from the standard ones.

More about the day of the procedure is in the article “How to prepare a dog or cat for a dental procedure”.

What to ask your vet before anaesthesia

Do not hesitate to ask questions: owners who understand the plan feel calmer on the day. It is worth asking:

• Who gives the anaesthetic and watches my pet during the procedure?
• Which tests does my pet need, and why?
• How are its chronic conditions and medicines taken into account?
• Which parameters are monitored, and will local dental nerve blocks be used?
• What happens if the radiographs show more problems than expected?
• How will pain relief at home be organised, and when is the check-up?

Recovery at home: what to watch for in an older pet

Older pets may recover a little more slowly: on the first evening they are sleepy, unsteady on their feet and less interested in food. This is expected, but each following day should bring improvement.

• set up a quiet, warm spot so your pet does not need to jump onto the sofa or use stairs;
• put down non-slip flooring — after anaesthesia, and even more so with arthritis, it is harder to keep balance;
• feed as advised at discharge — after extractions soft food is usually recommended;
• give the prescribed medicines on schedule, and regular medication as agreed with your vet;
• check that your pet drinks, urinates and that its appetite is returning.

I explain how to care for the mouth after treatment in the article “Aftercare following tooth extraction”. If anything worries you, it is better to contact the clinic straight away and ask than to wait.

What the cost depends on

The exact cost of treatment can only be given after diagnostics. It depends on the extent of pre-anaesthetic testing, the length of the procedure and how many teeth need treatment — which becomes clear after dental radiographs. Anaesthesia under the supervision of a veterinary anaesthetist is charged separately.

Frequently asked questions