So far it's been difficult getting one on ones with doctors. They justifiably shield themselves from solicitors and other annoyances (if I were a vet, I would do the same). You are right that vets typically rely on IT consultants, but there are two things that are slightly different (I believe) about the veterinary industry vs. human medical industry. For one, there are a large number of very small practices (2-3 vets total), which makes any IT expenses proportionally larger. Secondly, most have to rely on "generic" home town IT consultants which are not very familiar with veterinary needs, as there is not a robust veterinary-specific IT support industry. And to some extent we're trying to improve this vet/IT relationship by offering a very low-maintenance, flexible solution.
We've had more success meeting early adopters where they already are on twitter, facebook, etc. than by knocking on doors or making calls. Although I know we still have our work cut out for us and need to continue pursuing these in-person discussions.