['I picked up my son from daycare today and they said another kid had pushed him over and taken his toy.']
I'm sorry to hear that. Sometimes kids don't know how to interact well with each other. But it's an important part of the socializing part of life that they work their way through it. All you can do is tell them how to respectfully and appropriately respond and defend themselves.
I picked up my son from daycare today and they said another kid had pushed him over and taken his toy.