[matese]

So sorry about your sweet Collie, how very tragic. Yes deer can jump a 6 foot high fence, 8 feet they can't.
If you have a corner area close to the door that leads to the yard, determine how much area you want to devote to your pups. The area should near the side of your house and the 8 foot fence, these are used as walls.

You can hire a carpenter to put up 6 foot high 4x4's posts for roofing use chicken wire, although not attractive it provides air circulation and protection from prey birds. For the 2 remaining openings, one being a side the other being the front, you can use 4 foot high lattice as a wall,very attractive looking, use lattice for the front with a gate that locks to keep the pups contained. Just a suggestion.