Besides a window that can be seen by the front or back door..... affixing to the breaker box is also a great idea because if there is any type of fire or electrical issue that the one of the first place firepersons will go is to cut the breakers off!!! It is sometimes easy to see a dog, but for those who have cats they will usually be hiding somewhere and not easy to find, if they dont know they are there, they wont even look!
When we had our fire I actually thought quickly enough to close our bedroom door behind me, so the dogs stayed in there. it was the farthest point from the fire, and with the door shut, the smoke never got to them. We also had 2 cats at the time (that didn't like to sleep in our room with the dogs). I was very surprised that the cats had no issue going to the firemen. heck I was even more shocked they found the black cat in all the thick black smoke!