Weight = Water per Day Oz. /Cups
5 lb. puppy = 7.5 ounces or .93 cups
10 lb. puppy = 15 ounces or 1.88 cups
15 lbs. = 15 ounces or 1.88 cups
20 lbs. = 20 ounces or 2.5 cups
25 lbs. = 25 ounces or 3.13 cups
30 lbs. = 30 ounces or 3.75 cups
35 lbs. = 35 ounces or 4.38 cups
40 lbs. = 40 ounces or 5 cups
So as you can see, Beagle puppies should be drinking at least a cup of water each day, growing adolescents need increasing amounts of H20 as they mature and most adult and senior Beagles should be drinking 3 to almost 5 cups per day.
2. Activity Level-
The guidelines for water requirements takes into account the normal activities of a typical dog. If he has more activity than his normal twice per day moderate walks, such as a trip to the dog park, an extra walk, a game of fetch in the yard, etc. this will equal a greater need to rehydrate. Many owners assume that a Beagle will drink as needed, however this is not always the case (more ahead).
Beagle owners should take into account not just the outdoor temperature, but also indoor as well. For example, if it's the middle of winter
and chilly you may assume that there is no reason to encourage increased water consumption, however if the house is kept very warm with dry heat, there may be a need to boost water intake a bit which will help combat dry skin and other such issues.
Alternatively, if you're in the middle of the summer season, your Beagle's needs may or may not change. If he is only taken out for walks in the early morning and late evening, spending most of his time in an air conditioned house, he needs should stay about the same. If he's rather active outdoors, his needs may double.
As a side note, if a Beagle is indoors during the summer without a cooling system (i.e. the AC breaks, etc.) not only will he require more water, other cooling methods such as a cooling mat and/or bandana should be implemented as well.