I built the first Twitter-enabled litterbox nearly 10 years ago. Technically just Bluetooth instead of Wi-Fi, but it had internet access. There have been many copies since then, including one from Purina.
My cat’s running wheel and treat dispenser are both on Wi-Fi. But I built both (well, the speedometer, not the wheel), so it’s ok. The wheel is connected to the treat dispenser, so my cat gets a treat after a decent run, even when it’s 4 AM.