So sorry to hear about your babies! Mine throw up occasionally and have diarrhea occasionally too. My husband says it's due to giving them cheese and he's probably right. They don't get much but occasionally ... yes. I wouldn't think lettuce would do it, but fruit probably would. A lot of dog foods these days have veggies in them and dogs ARE somewhat omnivorous -- unlike cats who must have high protein.
I wouldn't feel badly about giving them veggies and fruit, just keep the fruit portion and DON'T FORGET GRAPES ARE POISONOUS TO DOGS. Best wishes to you and your clan. :)
