OT Dog Whisperers I need help.

So my wife and I have 2 dogs.

Dog 1 Small mix 4 years old about 12 pounds and very low key attitude wise. She is just a little lap dog.

Dog 2. Small mix almost 2 years old. She weighs around 8 pounds. Also a little lap dog.

Got each dog while they were puppies. They have ALWAYS gotten along great. Older dog took younger one in no issues. They always do everything together.

Well just lately (past month or so) dog 2 has gotten super umm I would say defensive over my wife and I. If she is in one of our laps and any other dog tries coming up she goes all devil dog and tries ripping their head off.

Once I seperated each dog and they both calm down I can put them both on our laps and they will just sit there like nothing happened and will even lick the others eye goop out of their eyes.

Our biggest issue is right now we don't have kids but they aren't far off. We don't want them to be caught in the crosshairs cause the little shite has even bitten me trying to get to the other one and obviously we can't have that with a baby.

So any advice? Figured I would try here first before the wife insist on petsmart or the vet.

Thanks