Extendable Fence

Abstract

An extendable fence is an underground fence barrier which prevents dogs from digging out underneath a fence and escaping the yard. The barrier is supported over the ground surface and includes a horizontal barrier strip with openings. Stakes are inserted trough the openings in the barrier strip and into the ground. The barrier strip extends the length of the fence section that is to be protected. The stakes are close enough together and sufficiently deep enough in the ground to provide an effective barrier under an existing fence. Also, the stakes are vertically adjustable to provide an effective barrier above the ground on uneven terrain whereby there is a gap between the fence bottom and the ground surface.

1 . An underground fence barrier to prevent dogs from digging under an existing fence comprising:
 a horizontal barrier strip near the bottom edge of existing fence;   a plurality of openings in said strip;   a plurality of stakes, said stakes being vertically oriented and coplanar with respect to existing fence and said barrier whereby one stake passes through each opening in said strip, and each of said stakes having a lower point driven below a ground surface.   
     
     
         2 . The underground fence barrier of  claim 1  wherein said horizontal barrier strip is held to the ground by a plurality of stakes. 
     
     
         3 . The underground fence barrier of  claim 2  wherein stakes of different length are used along said horizontal barrier strip. 
     
     
         4 . The underground fence barrier of  claim 1  wherein said openings are keyed to the cross sectional shape of said stakes. 
     
     
         5 . A method for preventing dogs from digging under an existing fence comprising:
 attaching a a horizontal barrier strip near the bottom edge of existing fence;   inserting a stake through each said opening in said strip;   driving said stake into said ground below said ground surface whereby an underground barrier is formed which provides a barrier to any dog attempting to dig under the fence; and   vertically adjusting the stakes to cover any gaps between the fence and the ground.   
     
     
         6 . A underground fence barrier kit to prevent dogs from digging under an existing fence comprising:
 a horizontal barrier strip with a plurality of openings;   a plurality of stakes; and   a set of installation instructions.