My Emma is 9 weeks old and we have had her only 1 week. When we brought her home from the breeders she was eating Purina puppy and I wanted to switch her to a better food. I bought a sample bag of Artemis puppy and she loves it, but now her poo has been really soft.

It was soft before but not this bad, and it's not getting any better. Do you think it is the food? What should I do?