If the colors aren't mixing on their own, use more moisture from the puddles. Make it do what watercolor does so well - flow. Let the colors slowly move on their own with just a little help from your brush. Just a little. Sometimes artists stroke the brush over and over and over in an area, annihilating the fresh look of watercolor.
Mollie's coat had a lot of texture in some of the fur, and other parts of her coat were sleek. In the textured parts, I used granulating pigments like lunar earth or lunar blue to help suggest the texture of her coat. For the sleeker areas, I used phthalos and quinacridones, which have no granulation at all.
I do love painting animals and am so glad I got to paint Mollie.
"MICHIGAN MOLLIE" Transparent Watercolor on 140#CP Fabriano Artistico, 18 x 24" COLLECTED (Smaller portrait to the right is also on Fabriano.)