Dogs are very useful for critter control. If you are going to have a lot of domestic animals that need care, I would suggest looking into
LGD's (Livestock Guardian Dogs). If what you need to protect are fruit trees and vegetables and the like, you can be helped by any high energy dog. In Dane County, WI, there was a program to take dogs sent to the pound for being hard to live with and give them new homes guarding orchards. These were area-appropriate dogs, like huskies, and they lived outside year round. I think they installed an "invisible fence." (I only know what I found out when I asked about the dog at our CSA.) Depending on the pressure, your own dog may be able to handle it, especially if you have a dog door to allow rapid exits. At our place we have a "three season" room with a (doubled) dog door, and that's where the dogs hang out if we are not at home.
Of course, I've got to bring up
bone sauce. (Burra tried making it--it worked to stop some animals, didn't stop donkeys.)
Here's a link to Paul's video about bone sauce.