When trying to find a safe way for you to be able to roam free throughout the yard you might choose the option of a wireless fence. This is a good option opposed to chaining your dog up or having a huge ugly fence blocking your whole yard, but keep in mind that sometimes wireless fences have their own flaws.
How Does PetSafe Wireless Instant Fence Work?

It requires that you put a specialized collar on your dog that you will be used to give your dog the warning signal that they have traveled out of the range of the wireless fence. You can choose from the high and low charge to warn your dog, this does not hurt the dog, but instead teaches the dog that once they get to a certain spot in the yard that they will get this kind of single and is suppose to teach them to stay away from any of the flags that you have put in the yard to show them were their boundaries are. The PetSmart wireless fence claims that it covers up to 100 yards around your house. You can set the box inside and it will still control the dog outside. You can choose through setting 2-10 that gives you the distance that you are allowing your dog to roam.

You can view the rest of this article at Associated Content and find out if this type of fence works on a Jack Russell?

PetSafe Wireless Instant Fence and Accessories