Cosmo did break the skin on Simon's ear, but it didn't bleed it was more like a small scratch. Daisy picked Simon up by the throat and kinda threw him. I have tried Daisy and Cosmo one at time with Simon and it didn't work, I was in the floor with them and everything will be fine at first and within a few seconds they have him on his back and he cries. They aren't playing like they do with Jersey and each other...Daisy and Jersey sound like they are fighting to kill but they are just playing...nobody has ever been hurt. Same with Cosmo, he'll chase Jersey all over the house biting (just playing) her stubby tail but he has never hurt her. We've tried hubby holding Simon and I'll hold Daisy or Cosmo, let them sniff each other and be near one another without actually touching...Daisy and Cosmo will act perfect until we let our guard down for a second and they will lunge at the pup and growl 
 
 
Another thing that happened last night, Daisy snapped at my husband when he picked her up for her bath. I don't understand what's wrong with her, it can't just be the new pup because we haven't had Cosmo that long and she accepted him right away. I am really upset, I've had dogs all my life and my husband and I have never been without several dogs, we've never had a problem this bad. Daisy gets a lot of exercise, I have two sons who take her out to play everyday...she gets tons of attention. Cosmo doesn't get as much outdoor exercise as he needs and is a little overweight but he does play inside. I don't want Simon to get hurt, and I don't want Daisy and Cosmo to be unhappy. Both Daisy and Cosmo had an appointment with the vet not long ago, everything was okay with both of them.