In the management of a clinical canine lower urinary tract infection, which therapy is considered first-line?

• A. Analgesics while awaiting culture
• B. Amoxicillin/clavulanate or TMS first line
• C. Antibiotics for 3-5 days
• D. Cefovecin

Answer: (B)

For uncomplicated canine lower urinary tract infections, start an antibiotic with reliable activity against common uropathogens and good urinary penetration. Amoxicillin-clavulanate or trimethoprim-sulfamethoxazole are classic first-line choices because they cover the usual bacteria (such as E. coli) and address potential beta-lactamase producers, while remaining safe, affordable, and suitable for oral administration. This approach supports effective treatment while allowing culture and susceptibility testing to tailor therapy if needed. Analgesics alone don’t treat the infection, and a short 3–5 day antibiotic course is usually insufficient for UTIs. Cefovecin, though convenient, is not preferred as first-line for uncomplicated LUTIs due to stewardship considerations and lack of culture-guided adjustment; it may be reserved for specific scenarios where dosing compliance is a major issue.