There are a couple of things you can do to prevent your dog from getting lungworm. If you see snails in your garden be careful with your dog don’t allow them to eat them. Always check any bowls or toys that are left outdoors to make sure there are no snails or slugs on or in them.
If there are snails or slugs in your area it is a very good ideal to use a monthly preventative treatment. This is something your vet can give you advice on.