Dog lungworm are carried by certain slugs and snails.
Check out the BAYER website, it gives lots of really useful information about the parasites - fleas, ticks, mites, worms, and details of what the products cover.
Advocate definitely will help for lungworm prevention, and treats roundworms, mites and fleas. It's not licensed for ticks, but potentially will have some effect.
My dogs get SERESTO collars from Bayer which kill and repel ticks - my long haired German Shepherd only got one tick in the whole of his holidays in Mull, running around in the bracken!