There are a number of electronic pet doors on the market, but as far as I know, the only two that are easily integrated with smartthings are the petsafe zigbee model:
And the Easy Out dog crate door lock, which is based on a WeMo Wi-Fi device.
https://www.amazon.com/Easy-Out-Remote-Pet-Door/dp/B018GSCO60
Manufacturer website:
Both of those are basically just automatic locks, though.
There are also a couple of do it yourself projects described on the quick browse list for “animals“ in the community – created wiki.
Have you integrated the HiTech door with SmartThings, and if so, how? 