Ethical breeders

I’m hoping to get a Dalmatian in the next few years and am trying to start my search for ethical breeders near me (Denver, Colorado), but am willing to travel to pick up my puppy when the time comes if I have to. I had reached out to a few back in August (I can’t remember their names at the moment), but they never responded to my emails. Anyone know of any ethical breeders and what the best way to contact them would be?