My vet prescribed cephalexine for my 6 months old german shepherd. She,is supposed to take it twice a day. Earlier today she was given her first dose and next dose is due this evening. She got another medication for pain that was not yet given and I was instructed to give it when we get home. I followed the instruction but I happen to give another dose of cephalexin as well when it was supposed to be given in the evening. Will this give adverse side effect to my dog? Your answer would greatly be appreciated. Thank you.