Fossilize and wait for several million years before sending for a passing darwinian evolutionist.
Sit back and watch how the explanations will tell you emphatically how these creatures 'evolved' one into another over vast periods of time and utterly ignoring the disregarded facts that:
a] The animals are 100% contemporary and
b] Any changes are merely within their genetic parameters.
Evolutionism is grotesquely simplistic, you see - as well as being most UNscientific.
[Under no circumstances should you include any dachsunds in your experimenting as this would be just too cruel to future evolutionists!]