You will need to buy a role of welded wire mesh to cover the run. Chicken wire works but is not as strong and can look untidy.
Wire mesh often comes in roles 900mm wide, which is perfect for this design. If you attach a 900mm role vertically up the sides and then across the top, there should be no off cuts because it is just under 900mm between the timber beams.
Now line the end of the run that attaches to the kennel with mesh, except the opening that the kennel door rests against.
You should now be able to install a clip on either side of the kennel to attach it to the run. You should find lots of options for this clip at your hardware store. Even two simple gate hooks would do the job.
We hope you have found this plan useful.