I've seen a lot of boots where they just cut the heel off, and you balance on the ball of your foot. They're quite comfortable and not that hard to construct.
I wear tabi or regular boots for my wolf just depending upon weather. Toe shoes are also an option, but you would probably want to cover up some of the reflective or colored areas.
if you have to cover a zipper, just get some faux fur and tuck it into the zipper handle and get a piece of double sided tape and tape the bottom down.
As someone who has made stuff like this for several years... these (the variety of design where you are on your toes, with no heel support) are -not- good for larp where there is physical combat and a lot of running around. The average person will not be happy after about 4 hours and your movement will be impeded plus its really easy to damage an ankle if running or in uneven terrain. They are better for parlour style games, conventions and cosplay. Had several clients ask me about this.
This style though, where you are hiding the sillouette of your leg, but your feet are otherwise normally positioned (tho in this case, thee is a tiny amount of heel on the shoe, and thats fine) is completely safe for larp. http://magpieb0nes.deviantart.com/art/Quik-Digitgrade-Video-207318445