How often is it recommended to get a heartworm test for dogs?

How often is it recommended to get a heartworm test for dogs?
Every 2 years
Every year
Only if I miss prevention
Only outside dogs need it
How do you test for heartworms?
Poop sample
Blood sample
Heart sample
Saliva sample
{"name":"How often is it recommended to get a heartworm test for dogs?", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"How often is it recommended to get a heartworm test for dogs?, How do you test for heartworms?","img":"https://www.quiz-maker.com/3012/CDN/77-3576262/hwt.jpg?sz=1200-00000012711000005300"}
Powered by: Quiz Maker