Presume you mean Massey in New Zealand? (Is there another Massey elsewhere??)
Anyway, seeing as no Massey graduates have jumped in here...I'm planning on applying there this year and have had a quite a bit of contact with the administrators regarding admission requirements etc (as a New Zealand student). Without wanting to speak for them, I think they do offer some flexibility in terms of when you last studied - e.g. for myself, they are happy to use some marks from 14 years ago for my application.
However, they are quite strict in terms of subject prerequisites - for example, even though I have a PhD in biochemistry and had met all the chemistry and biology prerequisities, I had never done a university-level physics course, and they insisted I do one before I could apply.
It is quite difficult to get accepted into Massey - it's the only vet school in New Zealand, they only offer 72 places each year and have around 300-400 applicants. That's for domestic students, but I imagine a similar situation would exist for the intake of foreign students.
From what I have heard from talking to recent graduates, the course itself seems to be regarded as tough but also fun, and apparently the school is very supportive of the students. I don't think foreign students are treated any differently whatsoever.
Not sure if that helps, here are a couple of links that you might find useful:
http://vet-school.massey.ac.nz/selection.asp
http://sciences.massey.ac.nz/degrees/degree.asp?ID=34