My chihuahua is 4 years old and my golden retriever is 8 weeks and a feisty little girl i must admit .?

my chihuahua is 4 years old and my golden retriever is 8 weeks and a fiesty little girl i must admit but my chihuahua is very calm and since i got her he really trys to ignore her and sometimes she wants to play and he doesnt and he ends up bitting her not harsh but enough to scare me what should i do?! i mean i do everything the same with both of them but i try to pay attention to him a lil more because after a while he doesnt want to come to me when i call him so i just lock her up and play with him!!