My friend was telling me about a 7 week old Yorkie in her neighborhood dog park that was attacked and killed by a pitbull (leashed). The dogs were playing in a group and the pitbull went after the little baby. Got him by the neck. Hit an artery and by the time they got the baby to the vet he lost to much blood and died. Though it is horrible I don't think a seven week old baby should be playing in a dog park, nor should a pit bull be allowed in a dog park.