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.
So, for example, a 3-month old puppy should be able to hold its urine for approximately 4 hours in a pinch. This means that if you have a properly toilet trained 4-month-old puppy that, theoretically, can hold its urine for 5 hours, and you shut that puppy in a crate for 6 or 7 hours, you are courting disaster.
The rule is that a puppy can only hold his potty for the same number of hours as his age in months. So a 3 month old puppy can hold it for 3 hours, a 4 month old for 4 hours, etc. At about 6 to 8 months your dog should be able to hold his potty for an entire night. During the day it is different though, and each dog is different. You need to be aware of your puppyâs potty habits.