Do you have a sling shot? You can get something serviceable for about ten bucks. You can get balls for about three and save them for when you really have an emergency and using peach pits and acorns will help a goodly bit persuading neighborhood dogs that you're too much trouble to mess with. Someone suggested this to me for a coyote problem and it really helped to put my mind at ease. From 250 yards you can discourage without putting yourself at risk.
You'll never be 110% predator proof, but so long as you're a harder target than the neighbors pets or pet food, you can make your property relatively safe.
I would walk the property and clear brush, overhanging branches - mow up to your fence lines if you have adjoining fields, take away their stealthy approach to at least 25 yards and make sure anything with a protein smell, pet food, garbage, water sources are well secured and/or away from the animals. If you have a male dog who will mark, I would walk him on your property lines through the brush and hopefully he'll cooperate and mark where he smells intruder. We had some casualties that were solved by keeping the back field low. When the weeds got high they had a secret approach and by the time we'd see them it would be too late to do anything.