The rectangular shaped dog run will have 2 sides that are 8 ft long, so a total of 8 x 2 = <<8*2=16>>16 feet will be for width in fencing.
For the length, 40 - 16 = <<40-16=24>>24 feet of fencing will be for the length.
Therefore, the length of the rectangular dog run will be 24 feet. Answer: \boxed{24}.
Sari is creating a dog run space in her backyard. She has 40 feet of fencing to go around outside, and she wants to make it rectangular with a width of 8 feet. What will the length be in feet?
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