Water & Nutrients. Like humans and animals, plants need both water and nutrients (food) to survive. Most all plants use water to carry moisture and nutrients back and forth between the roots and leaves. Water, as well as nutrients, is normally taken up through the roots from the soil.
Changing from puppy food to adult food depends on the size of your dog as an adult. If he is a small breed and will not exceed 30 pounds, he is mature at 10 to 12 months old. Some small breeds are mature before 10 months of age. Medium breeds are dogs that do not exceed 80 pounds at full growth.
The best way to do this is to work in the adult food over a four day period. On the first day, you will want to feed your dog predominately puppy food and add only a small amount of adult dog food. Then, on day two, you should make sure that the mixture of puppy food and adult food is half and half respectively.