Oh dear, does he only do this when you pay attention to Bella? Could be jealousy or maybe he's being over protective? I'd usually try to discourage aggressive behaviors when i see it (even if it's cute a the time). Granted it doesn't always work currently, my girl is so stubborn at times. Maybe try greeting him first?
__________________  R.I.P. Mick & Mandy (before 2010), Mila - 4/3/15, Chloe - 2/18/16, Kimchi - 6/2/2021 |