You have done all the right things. However, you should talk to your neighbour and ask them to flea treat their dog. I know that can be difficult if you don't like each other, but the poor dogs are really suffering if they have fleas. A few drops once a month should keep them free of fleas.

Oh, and seach on the web for flea treatment solutions and the consequences for the dogs. Print it out and give it to your neighbour.

When you vacuum, make sure to empty the bag every time... outside and into bag that you keep closed. Fleas can reproduce everywhere, and eggs can live up to year. So vacuum every few days.

You van also spray carpets and furniture with juice from lemons, or squirt some lavender oil around. Perhaps start growing lavender outside for future use.

Good luck getting rid of the fleas!

Here's one link:
http://www.wikihow.com/Eliminate-a-F...n-in-Your-Home