It sounds like you might have made an abrupt switch, to which your pup isn’t accustomed. I would go back to the Fromm until things stabilize. When it’s time to start trying the Acana again, switch slowly by adding in a small amount of the Acana to a reduced portion of the Fromm. Try an 80 / 20 ratio to start. Only after your pup is stable on that ratio and has firm, formed stool for several days, is it time to increase the new and decrease the old.
Make sure to compare calories. The Acana may have more calories than the Fromm. Adjust your ratio and the amount you feed accordingly.
