stevethehydra
Well-known member
The juv Goshawks in that link do surprise me by how lanky/gracile they look, which does make me wonder if there is a difference in structure between North American and European subspecies. However, as well as the comments about streaking, they have much heavier bills than the OP's bird, so I'm still in the Cooper's camp.
Here are a number of pictures of juvenile Goshawks from the Canadian Peregrine Foundation. (I had the website up for a BF discussion on Coopers and Sharp-shinned Hawks.)
http://www.peregrine-foundation.ca/raptors/Goshawk.html
A number of these birds have long tails and a "lanky" look.
And OP says the bird was chasing a squirrel, a large rodent and a common prey for a Goshawk. Cooper's commonly prey on birds and small rodents.
Bob