Why do my dogs do this?????S?

I have 3 boxers and 2 cats. So the oldest dog of ours is 6 years old. She was the 1st one we got so she was always used to getting loved all the time. Then we got ANOTHER boxer who is now 3 years old. recently we got a puppy who is like 5 mo. The 2nd dog we got whines and barks hysterically when you pet another dog. The puppy bites the ankles of whoever your petting. The 1st dog doesn't care when you pet another dog, but why not if she was the first one. Wouldnt she be more jelous then the other two. The two who whyine and bite are males and the one who doesnt care is a female. Thx and no timee waster answers plz (i was just curious)