Cabin temperature monitor

We have two dogs that we leave in the motorhome for several hours at a time while at the beach, dining, etc. We are concerned that if the AC should trip off for some reason the temp would rise to a dangerous level in the motorhome. I am looking for a unit that would call our cell phones in the event of a high temp. I know these are on the market but would like some comments on some of them that you guys might have experience with. pros and cons.
Thanks!