it might be to assert dominance. if this keeps up you need to separate them or it could get worse or possibly lead to the little ones death. the same thing happened to mine. mine ended up dying. i hope you get the info before its too late<3 best of luck
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the blondie is his brother charlie and they are best friends :) Grayson is constantly sick and his colouring and health issues have me thinking he might have roan