thanks for you reply, i give her 2 handfulls of food 4 times aday...xx
charly,
Try a measuring cup instead of by the handful for determining how much food you are giving the puppy.
Overfeeding is a common cause of diarrhea--particularly in puppies. And what the heck is Purina beta? Purina ProPlan (several different formulas) is what I feed and I'm pretty familar with the Purina lines--but I've never heard of "beta".
I don't know that the evening meal would be the best one to cut out--although I certainly don't feed four times a day at her age. Ideally you want the food given at fairly even intervals so that there isn't a huge gap between meals. I usually feed breakfast, lunch and dinner--about six hours apart and generally have puppies on two meals a day by the time they are 4-5 months--or when ever they stop eating all of the food in all of the meals.
Change of water is sometimes responsible for diarrhea too--but you would normally see that start to clear up in a week on your water.
Good luck with your puppy.