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.
How to Switch. When you decide it's time to switch your puppy to adult food, make the switch gradually. Start to wean your Lab off the puppy food and onto the adult food bit by bit, no more than half a cup at a time. On the first day of the switch, you might feed a cup and a half of puppy food and a half-cup of adult food. On day seven, you might feed 1-and-a-half cups of adult food and half a cup of puppy food. If your puppy starts to have digestive difficulties, such as loose stool, take the switch a little slower.