There are actually 4 canid species at the zoo (grey, red and maned wolves and grey foxes) and all have decent habitats.
An excerpt from my 2012 review:
Wolf Observation Learning Facility – This area is terrific as there is a rustic viewing cabin that looks out onto the grey wolf exhibit, but also an air-conditioned more modern cabin that has spacious viewing windows into both the grey wolf and red wolf exhibits. On my visit there were docents (volunteers) with a live snake and other goodies at a desk, while there were extremely active wolves in both exhibits. It was enjoyable to step out of the humid air and both wolf habitats are grassy and large but not too dense with foliage to hamper viewing conditions.
The last Gray Wolf has actually died, and the zoo is currently looking to find some new ones.
I'm glad you liked all the canid habitats, but the Gray Fox enclosure is a bit too small for my liking, but it's not all bad.