This extension lets you use Google Hangouts as a pet webcam
Install Hangouts Helpers on computers you want to use as pet cams.
Create a Google Account for your pet cams (they can all use the same account).
Next, set up a Google Calendar event with video call. Invite the pet cam Google account.
From each pet cam's Chrome browser, join the Hangout via the pet cam calendar.
Follow the instruction prompt asking for your name.
Cat image license information:
Dombrowski, Quinn (2014). Party crasher. https://flic.kr/p/j6TyRE. CC BY-SA 2.0