still haunts her owner. she started throwing up blood. she started passing blood. she actually was throwing up blood clots that looked like pieces of liver. reporter: sadie s vet thought it was due to the treats. i was devastated. i almost started crying in his office. i thought, i killed my dog. i had no way of knowing that. you go to the store, you look at chicken treats. they looked like something i would eat myself. reporter: it turns out sadie is not alone. the food & drug administration has received more than 4800 complaints over sick pets, including 1,000 dog deaths possibly linked to chicken, duck, or sweet potato jerky treats. it doesn t surprise me. that number is probably a lot more. the fda is only able to go to the numbers reported by them by pet owners or veterans so that number is probably a lot higher. reporter: dr. brett levitsky