Breeds of dogs doesn't prove evolution. It isn't even an indicator, really.
Think of foxes in Canada. White foxes. During an ice age, they would likely flourish because their white coats blended in with their environment. By blending in with their environment, they were better equipped to hunt and catch prey; and to evade and escape predators. Any time a fox was born to this species that was not entirely white had a survival disadvantage. Its darker spots or colors made it stand out against the wintery backdrop; thus they had a harder time hunting for themselves and a harder time escaping predators. As a result, these foxes rarely grew to maturity to have a den of cubs; passing on their genetic trait of spots or darker colors.
Ice ages don't last. The ice caps melt, the treeline extends, and now the environment where these foxes once flourished changed. Against the backdrop of pine trees and brown earth and ground, the white foxes now struggled to survive; their white coats made them stand out against the environment that was now robust with darker colors. Ironically, it was now the foxes that weren't completely white who had the survival advantage; as their darker colors and spots helped them hide and blend in with their environment, better equipping them to catch prey and avoid predators.
Many totally white foxes died of starvation or were captured and eaten by predators. The foxes that weren't completely white were now the ones that grew to maturity and had a den of cubs; passing on their genetic trait of spots or darker colors.
After a few successive generations, white foxes in this environment were all but unheard of; and as the genetic trait of darker colors was passed down, their cubs became darker in color over time. Those who did not share the genetic trait of darker coats became all but extinct as their lighter colors was a hindrance to their efforts to survive.
The only difference between this example and domesticated dogs is that the domesticated dogs were selected by humans for favorable traits; just as in nature, the wild foxes were selected by the conditions of their environment for those traits that were beneficial to their survival.
We actually see this in field mice along our coastlines; where, as we start (for example) South and move North, we see changes in the species of field mice and changes in their characteristics. Mice may be able to mate with their neighbors and bear offspring; but when we take field mice from the northernmost region and pair it with a field mouse from the southernmost region, their genetic constructs are too different to produce viable offspring.
Different breeds of dogs are a compelling indicator that staunchly supports ToE.
