Search under "baby monitor" if limited to a single space like those on the link. What did you do with your old phone? Daughter set up her old iPhone 5 - don't need to make fully operational with additional cellular line, just link to wifi. Now if you want full house - as dogs move about - and recording, then something more sophisticated than those on the link. There are many brands to consider.
I personally have full security outside and could easily add an interior camera to the system. However, prior to that, experimented with an Arlo system when went to Europe for 3 weeks. Ultimately returned it a wife didn't like presence of interior cameras - working or not. Also, wasn't impressed with that system as a security device when so easy to identify its control location and deactivate (steal). Essentially, the network control/recording box attaches to the router (no wireless option) placing it near the computer control systems. It also has the alarm as part of the control box - directing the intruder to the location, and deactivated with a big "STOP" button on top. With it deactivated, recordings have stopped and taking it (plus anything else - like the TV and computers) also takes the recordings of the initial actions that set off the alarm.
