A.G.
I have a Schnorkie (Schnauser/Yorkie mix) who is terrified of storms. She sleeps on our bed and was keeping us awake with her shaking and panting. We finally asked the vet for some advise and they prescribed Valium. We give her 1/4 a tablet when we know a storm is coming in and another 1/4 45 mins later if she is still shaking/panting. We call her our little storm warner. We see her pacing and panting long before we hear the thunder! Although I don't like to rely on drugs, this is the only thing that has helped. She still won't go outside to do business but she can hold it for days! I just make sure she doesn't have access to any rooms with carpet, just in case she has an accident.
My 70# pointer mix is also hates the rain, doesn't get scared, just doesn't want to get her feet wet! She will hold it for as long as possible, she's gone 24 hours before! If it's still raining, she will finally go outside and pee on the patio.