People are finding the Vitamin D really helps their pets

Especially those pets at high risk of being vitamin D deficient - similar to list of humans at high risk

• Seniors
• Stay out of the sun
• Do not eat organ meats or lots of fish
• Overweight

Vitamin D for Pets items added in April and May 2012

• Vitamin D for Your Dog – A Beagle’s Happy Days April 2012 by Vitamin D Survivor
  Dog age 10 was in some pain and moving slowly Added 20-40 IU per pound of body weight
  Played with the new puppy and enjoyed another happy 5 years.
• Senior pets rejuvenated with vitamin D
• Anyone Give Vitamin D to Their Dog? PaleoHacks July 2011
  Loads of conflicting information:
  ~hs~~hs~Dogs make it their fur.
  ~hs~~hs~~hs~~hs~No, they make it in their skin.
  ~hs~~hs~~hs~~hs~~hs~~hs~No they don't, they need it in their diets.
  ~hs~~hs~~hs~~hs~~hs~~hs~~hs~~hs~You need to supplement.
  ~hs~~hs~~hs~~hs~~hs~~hs~~hs~~hs~~hs~~hs~You'd better not supplement.
  Person thought that this was the best answer: Furred animals and vitamin D April 2010
• Fat Soluble Vitamins: A, D, E & K in Dogs
  227 IU of vitamin D per pound of FEED. 10X that much is toxic if given for months
• Vitamin D -- for pets, sunlight isn't enough June 2010
  " . . the dog and cat were central figures in the discovery of vitamin D as an essential nutrient. In experiments by Sir Edward Mellanby (1919),"

Overview Veterinary and vitamin D

has details on vitamin D needs for animals and pets such as Reptiles, Turtles, birds, etc.

Note:

1. Vets and the US govt consider that Vitamin D2 should not be given to any primate (we are a primate, right?)
2. Vets give 3X as much vitamin D per pound than the US govt says is needed for animials (or humans)
   But, vets are paid to keep their customers healthy, thus they ignore recommendations which might decrease their income
   Doctors on the other hand . . . .

Vitamin D IS a rat poison Nov 2010 in VERY HIGH doses

Lethal dose which will kill half of the rats (LD-50) = 17 mg/kg of rat = 680,000 IU per kg Thus for a 100 kg rat (weight of an human adult) the LD-50 would be 68,000,000 IU = lethal