What are urinary pseudoliths?

Urinary pseudoliths are accumulations or ossified deposits in the urinary tract that resemble true stones. They can cause urinary irritation or changes in urination patterns and require imaging and urinalysis to evaluate — consult your vet for further examination.

What tests will the vet use to identify the cause?

Common tests include a physical examination, blood and urine tests, X-rays, and abdominal ultrasound; a CT scan or bacterial culture may also be arranged to clarify the cause and pinpoint the location.

What can I do at home to help with diagnosis?

Record when symptoms started, urination frequency and urine colour, and vomiting episodes, and film urination on video; if possible, bring a refrigerated urine sample as instructed by the clinic.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Urinary Pseudoliths in Dogs & Cats: Symptoms, Diagnosis & Care [2025]

Non-stone foreign material in the bladder (dried blood clots or ossified deposits) requiring imaging to confirm and rule out other conditions

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: ACVIM, ISFM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Complete inability to urinate or straining with no urine output
•Heavy blood in urine with noticeable change in mental status
•Persistent vomiting with inability to eat or drink

Schedule a clinic visit soon (within 24–72 hours)

•Frequent urination attempts but still able to pass small amounts
•Abnormal urine color or small amount of blood in urine
•Decreased alertness and activity but still able to eat

01What symptoms indicate a problem?

Urinary pseudoliths can cause urinary tract irritation or obstruction; common signs include behavioural changes and abnormal urination — watch for warning signs that may indicate a serious problem and seek veterinary care immediately.

Lethargy or noticeably reduced activity — less willing to play or move around
Reduced appetite or refusal to eat — missing several meals warrants attention
Repeated vomiting or prolonged nausea with food regurgitation
Changes in heart rate or breathing pattern, such as slowing or irregularity
Darker urine or visibly blood-tinged urine (haematuria)
Frequent urination, reduced urine output, or obvious straining to urinate

Seek emergency care immediately if you notice the following symptoms:

⚠️ Complete inability to urinate or obvious urinary obstruction
⚠️ Heavy haematuria accompanied by changes in mental status
⚠️ Persistent vomiting with inability to eat or drink

02How to assess the situation at home? Key observation points and when to go to the emergency clinic

Recording key information at home helps the vet quickly assess the condition and plan appropriate tests.

Note when symptoms started, how often they occur, and whether they are worsening
Track daily urination frequency, volume per episode, and colour changes (blood present?)
Record the number of vomiting episodes, what was vomited, and when
Observe whether alertness, activity level, food intake, and water intake have declined
Use your phone to film urination or abnormal behaviour for the consultation
Compile these notes and share them with the vet at the appointment

03How will the vet make a diagnosis? Common diagnostic tests

In-clinic tests can assess for urinary obstruction, infection, or ossified deposits and guide the direction of further treatment.

Physical examination

assess for dehydration, abdominal or urinary pain, and overall condition

Blood tests

evaluate kidney and liver function and check for electrolyte imbalances

Urinalysis and bacterial culture

detect infection, haematuria, or crystal components

X-rays

locate calcified or ossified material and assess its size

Abdominal ultrasound

evaluate the bladder, kidneys, and urinary tract structures

CT scan if needed for advanced localisation or assessment of complex lesions

04How is it treated and managed after diagnosis? Medication, dietary changes, and home care guide

Treatment is guided by test results; after discharge, diet management, follow-up imaging, and home care help reduce the risk of recurrence.

Medication or antibiotics as indicated by test results to control infection or pain
Switch to a prescription diet or adjust feeding to modify urine composition and lower recurrence risk
Regular follow-up visits for imaging and urinalysis to confirm improvement
Ensure adequate water intake at home and limit strenuous activity to aid recovery
Record any recurring signs and report them in detail at follow-up visits
Referral to a specialist hospital for advanced imaging or surgical evaluation if needed

05What should you prepare before the vet visit? Key information to help the vet quickly identify the cause

Written or phone-recorded notes on when symptoms started and daily changes

A simple log of urination and vomiting frequency and characteristics

A list of all current medications, supplements, and feeding habits

A refrigerated urine sample if possible (follow the clinic's collection instructions)

Video footage of urination or abnormal behaviour for the vet to review

Past imaging reports or test results to enable comparison and evaluation

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.