Is it ok too feed my dog an egg a day?

hello i have a lhasa apso - around 7 months of age - Is it okay to feed her an egg a day ?? V feed her pedigree but she won't eat unless v add egg to it!! she is a picky eater and i know its all my fault..........so i tried to feed her only pedigree ........but then i found out that pedigree isn't the best food for dogs??? And i'm helpless in this case as there is only pedigree ( and 1-2 other brands wich are also bad ) available....:( So i figured giving egg with pedigree wouldn't be that bad aftr all.....what do you think? And should i boil it? Scrambl? Or raw??? PLease help......