I have two male piggies about 2 years old. I was able to spend a ton of time with them when I first got them. About 8 months in my dog became very ill and I spent most of my time with her since she was only going to live a few more months. In the 6 months or so that I wasn't picking them up or petting them they have become quite aggressive. I've been slowly getting them to let me pet them on the top of their head but only when they know I have a treat in the other hand. Does anyone have some suggestions for making them cuddly again?