Angiostrongylus vasorum is found in right side of heart and pulmonary artery. Clinical signs cough and breathing difficulties.
Oslerus osleri lives in trachea; clinical signs as above.
Crensosoma vulpis lives in airways clinical signs similar to kennel cough
No one wormer will deal with all three, treatment depends on accurate diagnosis.
Vectored via infected faeces, slugs, snails, frogs, foxex and even direct licking of each other.
There is no preventative apart from preventing dogs eating faeces, snails, slugs and coming into contact with infected dogs/foxes