Wireless bluetooth thermometers?

I'm looking for a good wireless blue tooth thermometer to monitor the interior of the motorhome for our dog while we're out during the day.

It's always bothered me that an ac would shut down or the motorhome would lose power for whatever reason and we'd lose our dog.

Any suggestions for a wireless blue tooth thermometer for an i-phone?

We typically are only away from the MH a few hours to hit the beach or have lunch or dinner.

Thanks

Bob