mosquito and heartworm, what i learned this month

Doraemon got bitten so many times last week his ears look like pizza lol. I did not know mosquitos can give heartworm to dogs even in the city. I thought only village dogs get it. Our vet in Prawet say heartworm test every year and monthly tablet from June to November is must, even for indoor dog. Daifuku is 4.8 year so we test her also. Tip: buy spray for the home not only the body spray. Mosquito come in from balcony and bathroom drain. I put the fan on at night, mosquito dont like the wind so much. Also water in the flower pot, empty it every 2 days. Very simple but I forget many times. Doraemon is sleeping in front of the fan now, he is very happy.