Definitely call the company right away! They mayhave an APPOINTMENT list that you can be put on.
Mom is on the appointment list for the elecric co and the doorbell ring list for the gas co, because Max will absolutely NOT tolerate a stranger in his house or his yard without an escort for even a minute--period, end of story. Mom's even had to put signs in the front picture window, and on the gate warning people there is a guard dog inside, and trespassers WILL be chewed on.
Mom's appointment deal works that they call her a few days ahead, and give her a 4 hour window when the reader will be in the area; that means she has to keep Max out of the yard for that time frame, to give the guy safe access. The gas company has her on a list that the guy has to ring the doorbell and be escorted to the meter, or he can't come on the property to read it.
Get on whichever list they have right away, though, and get documented confirmation of being listed. That way, if there's ever any issue, you have proof that you did YOUR due diligence, telling them that you have big, protective dogs, and that you informed them that reading your meter would require special arrangements.