For nervous cats and dogs you can purchase "Rescue Remedy for Pets" by Bach Flowers at your local health food store. Put some drops in their water bowl or on their paws. Really helps to calm them down for whatever reason they may be upset. They have a human version too, great for any stressful time in your life. Check it out at
http://www.rescueremedy.com/pets/ I gave it to my dog and myself when he broke his shoulder and we were both calmer for the trip into town to the vet. Our cat was calmer in the car after a dropperful by mouth for his trip to the vet. Should have put it in his water beforehand. I met a lady who uses it for her skittish mare. Good stuff!!