that is dr. max. he's a veterinarian. says jack was brought in 2 months old, very underweight with a lot of problems. >> i waited today and he's 22 pounds, way too skinny. let me show you a good side view of him. you can see his ribs, his hips. and the tailbone everywhere. >> this is a 10-month-old puppy. he was not gaining any weight. when dr. matt got him, he started doing some tests. he said for the dog to be treated, he had to get a very expensive inze ivive enzyme to over the food. the family couldn't afford it. the doctor said he would care for him as long as he could. here is jacks by a riverbed and notice that, that's a buzzard. >> look at that buzzard circling him. it's like he knows. >> finally the doctor takes an x-ray to see what's going on with this dog. >> we took him to surgery and cut open his intestines and it was full of long strands of grass and gravel and dirt and leaves and all kinds of junk. >> what was that dog eating? >> sometimes dogs eat grass when they have stomach issues and that's probably wha