NAVLE EXAM PRACTICE QUESTIONS QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
2025|2026 Q&A | INSTANTDOWNLOAD PDF
1. A dog presents with exercise intolerance, coughing, and right-sided heart
enlargement. Which parasite is most likely responsible?
o A. Toxocara canis
o B. Dirofilaria immitis
o C. Ancylostoma caninum
o D. Trichuris vulpis
Answer: B. Dirofilaria immitis
Rationale: Heartworm disease (Dirofilaria immitis) causes
cardiopulmonary signs and right heart enlargement in dogs.
2. Which agent is the most common cause of bovine mastitis in dairy cattle?
o A. Mycoplasma bovis
o B. Staphylococcus aureus
o C. E. coli
o D. Streptococcus agalactiae
Answer: B. Staphylococcus aureus
Rationale: Staph aureus is the most common contagious mastitis
pathogen in dairy cattle.
3. A horse presents with “choke” (esophageal obstruction). What is the first
step in management?
o A. Perform esophageal surgery
o B. Pass a nasogastric tube and lavage
o C. Withhold feed and water, sedate horse
o D. Administer IV antibiotics
Answer: C. Withhold feed and water, sedate horse
, Rationale: Sedation reduces anxiety and esophageal spasm; further
treatment follows with lavage if needed.
4. Which zoonotic disease is transmitted by unpasteurized milk and causes
undulant fever in humans?
o A. Leptospirosis
o B. Brucellosis
o C. Toxoplasmosis
o D. Salmonellosis
Answer: B. Brucellosis
Rationale: Brucella spp. are transmitted via unpasteurized milk and
cause undulant fever in humans.
5. Which diagnostic test is most sensitive for detecting parvovirus in puppies?
o A. Fecal flotation
o B. ELISA antigen test
o C. PCR
o D. Blood culture
Answer: C. PCR
Rationale: PCR is the most sensitive test, though ELISA is commonly
used in practice due to speed.
6. A chicken flock shows sudden death, green diarrhea, and hemorrhagic
lesions in multiple organs. What is the most likely cause?
o A. Newcastle disease
o B. Avian influenza (highly pathogenic)
o C. Marek’s disease
o D. Infectious bursal disease
Answer: B. Avian influenza (highly pathogenic)
Rationale: HPAI causes severe systemic illness, high mortality, and
hemorrhage in poultry.
,7. Which anesthetic agent should be avoided in sighthounds due to
prolonged recovery?
o A. Ketamine
o B. Thiopental
o C. Propofol
o D. Isoflurane
Answer: B. Thiopental
Rationale: Sighthounds metabolize thiopental poorly due to low fat
stores, leading to prolonged recovery.
8. Which structure is affected in canine cranial cruciate ligament rupture?
o A. Stifle joint stability
o B. Hip joint articulation
o C. Elbow joint extension
o D. Carpal flexion
Answer: A. Stifle joint stability
Rationale: CCL rupture destabilizes the stifle, leading to drawer sign
and lameness.
9. Which disease is eradicated in the United States but still monitored globally
due to zoonotic potential?
o A. Brucellosis
o B. Rabies
o C. Rinderpest
o D. Foot-and-mouth disease
Answer: C. Rinderpest
Rationale: Rinderpest was declared eradicated worldwide in 2011,
but remains a historical concern.
10.A cat presents with icterus and regenerative anemia. Which condition is
most likely?
, • A. Feline leukemia virus (FeLV)
• B. Feline infectious peritonitis (FIP)
• C. Hemotropic mycoplasmosis (Mycoplasma haemofelis)
• D. Chronic kidney disease
Answer: C. Hemotropic mycoplasmosis (Mycoplasma haemofelis)
Rationale: Mycoplasma haemofelis infects RBCs, causing hemolytic anemia
and icterus in cats.
11.Which dewormer is contraindicated in Collies with MDR1 gene mutation?
• A. Fenbendazole
• B. Ivermectin
• C. Pyrantel
• D. Praziquantel
Answer: B. Ivermectin
Rationale: MDR1 mutation in herding breeds predisposes them to
ivermectin neurotoxicity.
12.Which of the following is the primary vector of equine infectious anemia?
• A. Hard ticks
• B. Mosquitoes
• C. Biting flies
• D. Fleas
Answer: C. Biting flies
Rationale: EIA is transmitted mechanically by horseflies and deerflies.
13.A cow presents with left-sided “ping” on auscultation-percussion. What is
the most likely diagnosis?
• A. Left displaced abomasum
• B. Rumen tympany
• C. Peritonitis
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
2025|2026 Q&A | INSTANTDOWNLOAD PDF
1. A dog presents with exercise intolerance, coughing, and right-sided heart
enlargement. Which parasite is most likely responsible?
o A. Toxocara canis
o B. Dirofilaria immitis
o C. Ancylostoma caninum
o D. Trichuris vulpis
Answer: B. Dirofilaria immitis
Rationale: Heartworm disease (Dirofilaria immitis) causes
cardiopulmonary signs and right heart enlargement in dogs.
2. Which agent is the most common cause of bovine mastitis in dairy cattle?
o A. Mycoplasma bovis
o B. Staphylococcus aureus
o C. E. coli
o D. Streptococcus agalactiae
Answer: B. Staphylococcus aureus
Rationale: Staph aureus is the most common contagious mastitis
pathogen in dairy cattle.
3. A horse presents with “choke” (esophageal obstruction). What is the first
step in management?
o A. Perform esophageal surgery
o B. Pass a nasogastric tube and lavage
o C. Withhold feed and water, sedate horse
o D. Administer IV antibiotics
Answer: C. Withhold feed and water, sedate horse
, Rationale: Sedation reduces anxiety and esophageal spasm; further
treatment follows with lavage if needed.
4. Which zoonotic disease is transmitted by unpasteurized milk and causes
undulant fever in humans?
o A. Leptospirosis
o B. Brucellosis
o C. Toxoplasmosis
o D. Salmonellosis
Answer: B. Brucellosis
Rationale: Brucella spp. are transmitted via unpasteurized milk and
cause undulant fever in humans.
5. Which diagnostic test is most sensitive for detecting parvovirus in puppies?
o A. Fecal flotation
o B. ELISA antigen test
o C. PCR
o D. Blood culture
Answer: C. PCR
Rationale: PCR is the most sensitive test, though ELISA is commonly
used in practice due to speed.
6. A chicken flock shows sudden death, green diarrhea, and hemorrhagic
lesions in multiple organs. What is the most likely cause?
o A. Newcastle disease
o B. Avian influenza (highly pathogenic)
o C. Marek’s disease
o D. Infectious bursal disease
Answer: B. Avian influenza (highly pathogenic)
Rationale: HPAI causes severe systemic illness, high mortality, and
hemorrhage in poultry.
,7. Which anesthetic agent should be avoided in sighthounds due to
prolonged recovery?
o A. Ketamine
o B. Thiopental
o C. Propofol
o D. Isoflurane
Answer: B. Thiopental
Rationale: Sighthounds metabolize thiopental poorly due to low fat
stores, leading to prolonged recovery.
8. Which structure is affected in canine cranial cruciate ligament rupture?
o A. Stifle joint stability
o B. Hip joint articulation
o C. Elbow joint extension
o D. Carpal flexion
Answer: A. Stifle joint stability
Rationale: CCL rupture destabilizes the stifle, leading to drawer sign
and lameness.
9. Which disease is eradicated in the United States but still monitored globally
due to zoonotic potential?
o A. Brucellosis
o B. Rabies
o C. Rinderpest
o D. Foot-and-mouth disease
Answer: C. Rinderpest
Rationale: Rinderpest was declared eradicated worldwide in 2011,
but remains a historical concern.
10.A cat presents with icterus and regenerative anemia. Which condition is
most likely?
, • A. Feline leukemia virus (FeLV)
• B. Feline infectious peritonitis (FIP)
• C. Hemotropic mycoplasmosis (Mycoplasma haemofelis)
• D. Chronic kidney disease
Answer: C. Hemotropic mycoplasmosis (Mycoplasma haemofelis)
Rationale: Mycoplasma haemofelis infects RBCs, causing hemolytic anemia
and icterus in cats.
11.Which dewormer is contraindicated in Collies with MDR1 gene mutation?
• A. Fenbendazole
• B. Ivermectin
• C. Pyrantel
• D. Praziquantel
Answer: B. Ivermectin
Rationale: MDR1 mutation in herding breeds predisposes them to
ivermectin neurotoxicity.
12.Which of the following is the primary vector of equine infectious anemia?
• A. Hard ticks
• B. Mosquitoes
• C. Biting flies
• D. Fleas
Answer: C. Biting flies
Rationale: EIA is transmitted mechanically by horseflies and deerflies.
13.A cow presents with left-sided “ping” on auscultation-percussion. What is
the most likely diagnosis?
• A. Left displaced abomasum
• B. Rumen tympany
• C. Peritonitis
