I had Niko all of a week before he died. The vet says probably of a heart attack. I thought Niko was a baby. They said he was around 2-3 years. I was on my way to get him a new friend. When I came back with his new neighbor he wasn't making a sound of moving, so I went to pick him up and he was stiff. I was shocked. To bad he didn't get to meet his new friend:weepy: R.I.P. little buddy.