Ooo what about other canids that look like foxes? Like the maned wolf?
Or the Ethiopian wolf? (Which is also called a fox...)
Um, theres also the thylacine, which is probably my favourite extinct animal... (Darn those Australian farmers and the goverment!) It doesnt look like a fox, but its the largest most canine like rodent I know of. XD I saw a video of them once, I couldnt believe they were closer related to bunnies and rats than dogs... Anyway thats a real curveball if you want something similar to canids but very different. XD
Just throwing thoughts around, feel free to ignore them. :P