I hope that you've found the information on what to expect from vole and rabbit girdled trees and shrubs to be helpful?
Within the University of Georgia webpage below, you'll find an excellent description and photographs of a bridge graft.
If the link above doesn't work, click the "back" button on your browser to return to this page. Then, if you would, click on the link below to send me an e-mail to let me know that the link now leads to a page that's no longer valid. I'll then do my best to track down the new address for the page and/or point you toward a different resource.
Terry L. Ettinger Horticulture Consulting Services takes no direct or implied responsibility for the information or recommendations found at any other website. Please keep in mind that all do-it-yourself activities involve a degree of risk. Skills, materials, tools, and site conditions vary widely. The reader remains responsible for the selection and use of tools, materials, and methods. Always obey local codes and laws, follow manufacturers’ operating instructions, and observe safety precautions at all times. Please read all labels carefully before purchasing, applying and storing any pesticide.