A 2-year old male castrated Border Collie presents for a 1-week history of small bowel diarrhea. A fecal flotation shows numerous Giardia cysts. What is the treatment of choice for this dog?
一只2岁雄性已绝育边境牧羊犬由于持续一周的小肠性腹泻前来就诊。粪便漂浮检查提示大量的贾第鞭毛虫孢囊。这只狗的治疗选择是什么？
A - Decoquinate 癸氧喹酯
B - Metronidazole 甲硝唑
C - Albendazole 阿苯达唑
D - Ipronidazole 异丙硝唑