Some rabbits (not all) may become a little bit aggressive in certain situations as they grow older. This is not unusual, and may be more common with female rabbits than male rabbits.
It is important to determine the underlying cause of the aggressive behaviour including in which scenarios it tends to occur. Sometimes the underlying cause can be associated with fear, for example being picked up or reaching into the hutch can scare some rabbits. The best training tip is to use reward-based training in these situations. If your bunny won't come near you, you'll have to persuade it that coming up to you is a really good thing. The easiest way is with food rewards:
Sometimes aggressive behaviour may be associated with sexual maturity, so you should talk to your vet about desexing, which may help if the aggression is related to sexual behaviour. It's best to see a vet who is experienced with rabbits and who routinely desexes rabbits of both sexes.
Please see this link for more information: www.rabbitwelfare.co.uk/resources/content/info-sheets/viciousbun.htm
The Rabbit Welfare Fund also has other information articles including tips about how to prevent aggression.
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