we choose a track second year, and generally take one or two track classes per semester, and then two or three track classes per semester third year. Then for fourth year, everyone does the required core clerkships, and then you have required "track" clerkships, and then electives to do whatever you want. I'm a "Public Corporate" tracker, but I am taking everything from Small Animal Surgery to Bovine Ambulatory to Adv. Histopath.
So we aren't missing out on anything, because everyone takes the same 6 or 7 or 8 or whatever core classes that cover ALL species, and everyone does the same core blocks. Tracking really is kinda like a "directed elective" thing....it's not that we don't learn things in certain areas, we learn more in certain areas. Does that make sense?