I used the Grid method for the basic layout, as my 'original' was only 7cm x 6cm. This sketch is roughly 4 times that size (doubled width and height).
I didn't have all the colours suggested (no purple, orange, pink...), so I had to improvise. Hopefully you can at least tell he started life as a collie?
Ivor.
PS. I have noticed he doesn't appear to have any whiskers...