Hi Dawo,
I don't know the VideoIQ software, but I have worked with several motion detection analytic's. Many of them allow you to define the size of the object you want to be concerned about triggering the alarm/event.
Simple ones simply let you draw a rectangle around the space you want covered, and maybe adjust the sensitivity.
More sophisticated ones let you draw a coverage area, and draw a box for the smallest object you want to trigger the alarm.. and then the largest object you want to trigger an alarm.
A simple analytic that you set up to alarm on something the size of a person will be triggered by a deer.
A sophisticated one with littlest/biggest threshold might not trigger for the deer. You would probably need to test it quite a bit with something that size to fine tune it.
It may not be a big deal if it only happens once in awhile. You are likely to get false triggers on occasion with almost any system.
Not sure if it helps or not, but that's the basics from my experience.
Stallion