Lower urinary tract disease (Canine) — NAVLE Prep

Quick anchor

Trigger

Pollakiuria, stranguria, dysuria, or gross hematuria

First step

Make sure the dog is not obstructed

Localize

Bladder / urethra rather than upper tract

Trap

Do not dismiss stranguria in a male dog as simple cystitis

Exam core — read this first

Core signs → pollakiuria, stranguria, dysuria, hematuria, periuria

Board priority → identify whether the patient can still pass urine and empty the bladder

Common causes → bacterial cystitis, urolithiasis, urethral obstruction, neoplasia, sterile inflammatory disease

Localization logic → small frequent urinations point lower tract; systemic illness or renal pain pushes you higher

Pattern recognition

Core pattern

PollakiuriaStranguria / dysuriaHematuria

Supporting clues

Small urine volumesNormal appetite if uncomplicated cystitisDistended bladder if obstructedRecurrent signs with stones or tumorAccidents in the house

NAVLE trigger: Lower tract stems are solved by localization and urgency, not by naming every possible urinary diagnosis immediately.

Decision core — what NAVLE actually asks

Cannot pass urine / large painful bladder

→ Treat as urethral obstruction until proven otherwise

Stable dog with frequent painful small urinations

→ Lower urinary tract disease rises over primary renal disease

Recurrent signs or palpable abnormalities

→ Imaging and urine evaluation become important for stones, masses, or structural disease

Key interpretation

Urine volume

Small frequent voids

Classic lower tract pattern

Bladder size

Assess it

Distension changes urgency immediately

Systemic signs

Often absent

If severe fever/renal pain is present, think higher tract

Hematuria

Common

Localizes poorly by itself

Urinalysis

Useful

Helps assess infection, crystals, inflammation

Imaging

Often needed

Especially with recurrent or obstructive signs

⚠ Straining does not mean constipation until the bladder has been assessed. Obstructed urinary patients can be misread quickly.

Treatment

Step 1

Rule out obstruction and stabilize if the dog cannot urinate

That is the non-negotiable emergency branch.

Step 2

Use urine testing and imaging to define cystitis, stones, masses, or other lower tract causes

Treatment depends on the cause, not the sign list alone.

Step 3

Address pain, recurrence risk, and predisposing factors

Recurrent LUTD questions often want you to look beyond one antibiotic course.

NAVLE traps — where students lose marks

Do not assume every dysuric dog just has cystitis

Stones, masses, and obstruction can present similarly at first glance.

Straining can be urinary, not GI

A bladder check is a classic exam-saving move.

Hematuria alone does not localize to the kidneys

Lower tract disease commonly causes gross blood in urine.

Male dogs with stranguria deserve more obstruction concern

The board often tests urgency here.

Differentials — how to separate these on NAVLE

Fast separator: Lower urinary tract disease causes small frequent painful urinations. Separate it from upper tract infection and complete obstruction.

Problem	Typical sign pattern	Urgency	Board separator
Lower urinary tract disease	Pollakiuria / stranguria / hematuria	Variable	Localization to bladder/urethra
Simple cystitis	Stable dysuria + pollakiuria	Usually not crashy	Most common uncomplicated cause
Urethral obstruction	Straining with little/no urine	Emergency	Distended bladder / hyperkalemia risk
Pyelonephritis	Systemic illness, renal pain	Higher	Upper tract infection pattern

30-second revision

PatternPollakiuria + dysuria + hematuria

First questionCan the dog empty the bladder?

Most common causeCystitis

Big emergencyUrethral obstruction

TrapStraining is not always GI

Practice questions

Pre-built NAVLE-style · Lower urinary tract disease

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Q1Recognition

Which sign pattern most strongly supports lower urinary tract disease in a dog?

Q2Urgency

What must be excluded first in a dog with repeated stranguria and no meaningful urine production?

Q3Localization

Why does gross hematuria not automatically localize a case to the kidneys?

Q4Differential

Which added finding would shift a lower urinary case toward pyelonephritis rather than simple LUTD?

Q5Trap question

Which statement about canine lower urinary tract disease is most accurate?