My male dog tends to be quite possessive when the female comes around. It could be with food, toys, me, a pillow he is laying on, whatever. He will growl and sometimes attack her (more noise and growling, no biting). However, there are times when all he wants to do is play with her and do what she does. Is there anything I can do to stop his jealousy/sibling rivalry?

try to give them same amount of love and let's see what happens next