Here is one you can buy from YTNR:
Pet First Aid Kit - 29.00
Large 44 Piece Pet First Aid Kit with all the items you need for your pet's common injuries.
Contains thermometer, bandages, wound care items, antiseptic, tweezers, gloves, peroxide, dog leash,
pet first aid guide, and more. Organizers/wall mountable case.
http://www.yorkierescue.com/storelist.html
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Having a first aid kit is a great idea, but also knowing exactly what to do with the "stuff" in it is even more important.
A few things that I always keep are: hydrogen peroxide, liquid children's cherry-flavored benedryl, gauze, stretchable surgical tape, styptic powder, first-aid sprays that are both antiseptic and anesthetic, alcohol, pepto bizmol, as well as hydrocortisone spray and cream. I have a drawer of stuff that is just for my doggies that I've kept replinished for years. I can't even remember everything in there at the time, but I do have a first aid book that I've had for years in there, too. Hope this helps some.