pup was on vitalin but didnt seem as interested in it, i changed food to eukanuba for pups but now she has runs is this normal ?? she loves the newest food eats it all

Depends how old the pup is, if young then it is not good to ignore it, if an older pup the problem should clear in about 10 days. It is best to change food over very slowly but it is not the end of the world if you do it in one day.

Could just be because of the change in diet espescially if it was done very quickly. Dont worry too much but if it were my pup I would take her to the vets if it hasn't cleared up within 2-3 days. Vitalin probably isnt one of the best diets anyway usually just goes straight though them espescially pups but keep pup on the eukanuba and see how it goes
Good luck