check this out. it should get you started. http://www.youtube.com/watch?v=wOyibd6tDvo&feature=related
YOu are going to need a sturdy structure armature made of wood or pvc piping for the neck and head...the main body of the dog shouldn't be as hard just building the cake up to the head...I would probably use RKT and molding chocolate to do the head and part of the neck until you meet with the main body made of a sturdy carve worthy cake like sponge or pound cake. I would cover in fondant and use a sharp modeling tool to give a short coat fur effect then the best way to get animal color is with an airbrush...look at this awesome cake maker...she does the best dogs I have ever seen
http://www.flickr.com/photos/debbiedoescakesnet/sets/72157623115644273/
best of luck
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