I use beneficial nematodes from Arbico organics and have been VERY pleased with them overall. That is not 100% but it helps. Diatomaceous earth (food grade, not pool grade) can help in dry areas.
We have some threads on Springtime Garlic for the dogs. That is probably a call your vet would not support.
Also a tick must be attached 12 to 24 hours to transmit Lyme. Twice daily tick checks are in order during tick season.
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles