Patterns: Thylacine, Polkadot (dalmatian or cheetah), and Piebald (or Vitiligo).
As for the breeds: I think something with a short stubby tail would be cool! It could have a bigger body build and focus entirely on damage output in combat. It could also have longer front limbs to give it a slightly upwards posture, almost werewolf-like. An additional detail if you aren't afraid to experiment with fantasy themes: very small tusks :)
A breed with long, pointy, sideways-leaning ears, an elongated neck and long, bracchus-like legs. The fur gets denser around the neck and thins out as it goes down. I could doodle something like this when I'm home and update my post, but it's meant to feel like the elf of wolf species!
And lastly, a breed with short hair and a sleek body, somewhat resembling the ancient Egyptian god Anubis in his jackal form. Apparently there is a dog breed called the Pharaoh Hound which looks very similar to what I have in mind :)
+1 for all the Hyena suggestions!