You need to go to Animal Health Affairs. It will cost you just QAR 10.00. https://www.google.ae/maps/place/Animal+Health+Affairs/@25.2462291,51.5649112,17z/data=!4m6!1m3!3m2!1s0x3e45cf0fda86e359:0xa8519697504c0f39!2sAnimal+Health+Affairs!3m1!1s0x3e45cf0fda86e359:0xa8519697504c0f39

Located in old airport road. if the link doesn't work, just search in Google Maps.