We have had Cholla (choy-ya, like the cactus) less than a week. I decided to take him to the vet, just to get checked out. He's been so mild mannered so far, with us & friends. Even with the vet's assistant. But the INSTANT he saw the vet, he balled up completely & hisses & hissed. There was no comforting him until she left the room, then he came out of the ball for me. When she stepped back in, the same thing happened. And again, he was fine after she left. If he wasn't so upset, it would have been funny. But the last time, she snuck in & I continued to hold him close. She wasn't able to examine him, but checked stool for parasites. (Still charged the full fee though!) She has a few other hedgies that she sees, so she's familiar with them. Ultimately, she said he looked fine & was obviously bonding with us, which made me happy. I wondered, though, if I took him a bit too soon. But we took him out last night for our bonding time & he was just fine. Sleepy & cuddly.