The lady from the rescue said she thought it was Rickets
(Rickets is a disease of young, growing animals. The most common causes are dietary insufficiencies of phosphorus or vitamin D. Calcium deficiencies can also cause rickets, and while this rarely occurs naturally, poor balanced diets that are deficient in calcium have been said to cause the disease. As in most diets causing osteodystrophies, the abnormal calcium:phosphorus ratio is most likely the cause.), we took him to the vet yesterday and he said that she was most likely right. When we got him he could barely walk, he would drag himself across the floor and when he did get up it was only for a minute, but now after changing his food, putting him on a suppliment and lots of outside time, he is running around the house and playing with the other dogs.

He still gets tired fast but he has improved a lot since we got him. He is going to have to be on the suppliment and
puppy food until he is 2 years old but other then that he is perfect.