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I don't limit my dogs when it comes to water, they always have access to water but it's a limited amount (about 5 cups at a time). Fresh water is always best and I like to monitor the amount the dogs drink so I can notice if they are drinking more then usual which can be a sign of a UTI, diabetes, or other problems which should be checked by a vet.
Depending on what shape the dog is in you'll learn their limit. Dogs under 2 are still growing as their growth plates haven't fully closed so I would be a little more careful with a younger dog on the amount of running done each day.
GSD's are a double coated breed which really only requires brushing, I only bathe Delgado 3-4 times a year max and he really doesn't need more then that. Unless they roll in something unmentionable they really don't smell or are a oily coated breed like a lab
Blue Buffalo is a middle class food, some dogs do well on it and some don't. The reason why their marketing works is they only compare the really low quality foods to theirs which make theirs looks even better. Personally, I would rather recommend a food like Fromm, Acana, or Orijin which are really quality foods. In the end however the best food is the one that works for your dog and your budget, you might have to try 2-3 foods before you find one or you might hit it off right away.
I wish you all the best in your search
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 5 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010