Final answer:
A potential complication of performing a full hand scruff in a hamster is that their eyes can proptose, leading to potential eye damage or loss.
Step-by-step explanation:
A potential complication of performing a full hand scruff in a hamster is that their eyes can proptose, which means that their eyes can pop out of their sockets.
This can occur because when a hamster is held by the scruff, there is pressure on the back of their head and neck, which can cause the eyes to protrude.
If a hamster's eyes proptose, it is important to seek veterinary care immediately, as this is a serious condition that can lead to permanent eye damage or loss.