The collar does have BLE but I thought that would be a violation of my sisters privacy and I don’t want her to feel unwelcome.

Ii use esphome to flash the firmware on his shockcollar. Now when he barks the shock collar on my sister goes off and she gets him a treat.

Frankly you shouldn’t stop with just IoT devices. My sister wouldn’t listen to the HA so she’s not allowed over. It was a bit of a fight in the family but the dog listens so it got to stay and I think that’s totally reasonable.