My Splinter was like that too even though he came home to my first rat, Ratacus. For a whole 3 weeks or so, all he would do is hide and run away from my hand and all that. I eventually just picked him up and sat down on the couch with him and my lap and held him for 20 minutes and talked to him softly. Ratacus was also around visiting and wandering about. I spent three hours with Splinter, 20 minutes on me, 5 minutes off, 20 minutes on, 5 minutes off.. etc. It helped after a few days and now (about two weeks later) he's all over the place and constantly looking to me for treats. He recently learned to go to his ball on command.
