If your hamster has suddenly become aggressive towards you but not towards others, there could be several reasons behind this behavior change. Here are some possible explanations and steps you can take: Possible Reasons for Sudden Aggression.
Determining the most aggressive hamster is complex, as aggression is influenced by genetics, individual personality, environment, and handling.3. Why is my hamster suddenly aggressive? Sudden aggression can be a sign of illness, injury, stress, or a change in environment.

If your hamster suddenly becomes lethargic, hides more, stops using the wheel, or shows aggression when usually friendly, these are often early signs of disease. Watch for a drop in activity of >50% over 2448 hours, reduced grooming, or changes in sleep patterns.

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