Lithotripsy for Dogs and Cats: Breaking Up Urinary Stones

By Dr Duncan Houston

Some urinary stones can be broken into small pieces rather than removed through a conventional bladder incision. That sounds appealing, but the safest option depends on where the stone is and whether urine can pass.

Lithotripsy is a specialist technique, not a home method of encouraging stones to move. A blocked urinary tract needs urgent treatment before elective options can be compared.

Quick Answer

Lithotripsy uses energy, commonly a laser, to fragment urinary stones so they can be removed or managed more easily. Suitable cases may benefit from a minimally invasive approach, but anaesthesia, specialist equipment and follow-up are still required. Small anatomy, stone location and the number or size of stones can limit feasibility. Straining with little or no urine is an emergency.

How does lithotripsy work?

With laser lithotripsy, a small fibre is directed at a stone under visual guidance. Fragments may be retrieved with instruments rather than simply left to pass. Access may be through the natural urinary opening or another carefully planned route, so it is misleading to promise that every case involves no incision.

Shock-wave techniques focus energy from outside the body and have been used for selected upper urinary tract stones. Their suitability and availability differ, and fragment movement can create obstruction. Your specialist should explain the exact technique being offered, rather than using lithotripsy as if it describes one identical procedure.

Who may be a candidate?

Factor	Why it matters	Question to ask
Stone location	Bladder, urethral, kidney and ureteral stones need different approaches	Which structure is affected?
Body size and urinary anatomy	Instruments must fit safely	Is endoscopic access possible?
Stone size and number	Fragmentation and retrieval take time	Would another method be more efficient?
Infection or obstruction	May change urgency and risk	What needs stabilising first?

Female dogs are often easier to access endoscopically than very small male dogs or male cats. However, suitability is determined by the treating centre's expertise and the individual anatomy, not sex alone.

Could the stones be treated another way?

Some stone types can dissolve with appropriate medical treatment. Others cannot. Urine crystals do not reliably identify the entire composition of a stone, and a mixed stone may behave differently from the initial prediction.

The ACVIM consensus on urinary stones supports selecting treatment according to composition, location and risk, including minimally invasive removal where appropriate. Options can include dissolution, retrieval, urohydropropulsion in selected cases, conventional surgery or other specialist interventions for upper urinary tract obstruction.

What testing is needed?

Imaging defines stone location and burden. Blood tests assess kidney function and anaesthetic considerations, and urine testing checks for infection and other abnormalities. A stone or fragment should be analysed when available because prevention depends on its composition.

Symptoms can also arise from cystitis, infection, tumours or urethral disease. Finding stones does not mean every urinary sign has only one cause.

When is this an emergency?

Repeated attempts to urinate with little or no output, vomiting, collapse or a painful abdomen require emergency care. Do not wait for a lithotripsy booking. Suspected ureteral obstruction can damage a kidney even when the animal still passes urine from the other kidney, so follow urgent referral advice.

Recovery and follow-up

Ask what urine appearance and frequency are expected immediately after treatment.
Give prescribed pain relief and other medication; antibiotics are used when indicated.
Keep water accessible and follow the individual feeding plan.
Monitor actual urine output, not just trips outside or to the litter tray.
Attend imaging checks to assess residual fragments and recurrence risk.

Discharge timing varies. Some animals go home quickly; others require hospital monitoring. A minimally invasive procedure is not a guarantee of no discomfort or no complications.

Common mistakes

Assuming all stones can dissolve or all can be treated by laser.
Expecting fragments to pass safely without follow-up.
Using a generic urinary diet before the stone type is assessed.
Interpreting small dribbles as proof there is no obstruction.

Preventing another episode

Use stone analysis, urine results and the animal's health to build a prevention plan. This may involve a specific diet, increased water intake, infection management and scheduled urine or imaging checks. Removal treats the existing stones, not every reason they formed.

Frequently Asked Questions

Is lithotripsy surgery-free?

Some approaches avoid a conventional incision, but others require access through a small opening. Ask about the proposed technique.

Can cats have it?

Selected cats may be candidates, but their small anatomy often limits options.

Does it need anaesthesia?

Veterinary stone fragmentation generally requires anaesthesia and careful monitoring.

Can stones return afterwards?

Yes. Individual prevention and follow-up remain necessary.

Lithotripsy is one useful option within a broader stone-treatment plan. The best choice safely restores comfort and urine flow while addressing recurrence.

For more understandable urinary-health information, explore ASK A VET™.