I made one years ago for DD. I baked a fairly large square sponge (with jam in the middle) then covered it with roll out white icing. I then copied the shape of a dalmatian's face onto the cake and cut round it. Then I copied the spots, nose, eyes etc onto it. I'm no artist but I have to say it looked really good. I've got a photo somewhere (pre-digital cameras) which I can dig out tomorrow if you like?
Yes, my DD was obsessed with dalmatians and had a huge collection of ornaments etc. I did the Disney one because it was easy . Will try to find the photo though as I've never been any good at cakes and that one was quite good!
I would suggest going to google images and select DD1 favourite dalmatian. Print it and trace it onto a greaseproof paper and cut out the shape. Then trace the shape onto your cake. I normally use buttercream icing.