[Fester Chugabrew]

Current canines can change but they will still be classified as canines. It may be necessary to introduce new categories but these categories will remain a subset of the canine category.

So let us follow the nested tree backwards and point to the place where a canine is no longer a canine. What is it then? It should be easy to trace. This history is apparently so solid to evolutionary philosophers as to be above and beyond question. What does science propose as the point at which canines cross the line into a species, genus, or phylum other than that in which it currently resides and has resided throughout all of recorded history?

[Oztrich Boy]

So let us follow the nested tree backwards and point to the place where a canine is no longer a canine. What is it then?

An Amphicyonid (Bear-dog)