How to keep dogs away from yard?
Here's an article with some ideas for you:
A lot of dogs are stolen at the beginning of hunting season. The thieves keep the dog during hunting season and then turn them loose. They do not return the dog to the owner.
That is why they should be chipped. It is the only way the owner can get their dog back.
Some people swear by garlic, chili pepper, to keep the dogs away. Others say placing ammonia or vinegar soaked cotton balls around the part of your yard or garden that the dog is frequenting will drive them back.
The only thing that worked for me was a fence.
Citrus peel. It also works for cats.