Our Labrador killed our 9yr old Foxie and bit our other Dog help!!!?

Our Labrador that is 11 Months old killed our much loving 9 year old fox terrier by ripping it apart by the neck and we couldn't get them off each other, the Labrador also bit our 8 year old pekines in her neck yesterday and she survived and is staying in the house now...The lab has all her vaccinations and... show more Our Labrador that is 11 Months old killed our much loving 9 year old fox terrier by ripping it apart by the neck and we couldn't get them off each other, the Labrador also bit our 8 year old pekines in her neck yesterday and she survived and is staying in the house now...The lab has all her vaccinations and gets her attention by playing with her friend dog a cross breed small puppy by playing biting and running after each other and rolling over each other,but biting our foxie and pekanese why on earth would a dog start doing this? Our whole family is frighten by what happened last night, we are scared to take our lab to the vet that they will put her out...All our dogs are female...we have a son of 4 yrs old i would like to know if the Labrador started being so dominant do you think its safe for my son to be around her or is it just that she got jealous of the other dogs?But why kill a dog she grown up with?
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