This forum is specific to the Samsung SmartThings ™ home automation platform. So all of the questions and answers are assumed to be in the context of that platform.
(It’s a very busy forum, so it often comes up near the top in general Google searches, but it is not a general forum.)
Anyway, if you are using SmartThings and you want something compatible with that platform then your two choices are the new smartthings brand Wi-Fi camera or Arlo. Both are worth looking at.
If you don’t need integration with SmartThings , it’s hard to beat the Wyze cameras for basic features At a great price. 
For checking in on pets, I would recommend the slightly more expensive model that has tilt and pan so that you can look around the room.