Well, then.
a.) Give 'em both a raw T-bone steak.
b.) Spray the obnoxious beasts with a hose.
c.) Drop 'em off in a nice neighborhood far away.
d.) There is an app with a high pitch sound you can get. Only the dogs can hear it. Don't work too good, though, but it might for you.
e.) Move far away.
f.) Get used to it. That's my move. You should hear the bastard dogs in my hood. It's like a symphony when they get goin'.
New puppy dont mix well with old dog yet.
Call your neighbor with the barking dogs on the phone. When he answers, don’t say a word — just start barking until he hangs up. Worked for me more than once — especially at 3:00.am
I had a spare set of Electro Voice T-350 horns pulled from an auditorium sound system. Something like 105db 1 watt 1 meter. Had it setup that if the Rasberry Pi detected the neighbors dog barking an 18,000 hz pulsed tone would pump out at 20 watts pointed into the neighbors dog enclosure (My calcs showed 115 DB at 3 meters, ie almost jet engine sound level that most people can’t hear.) For some unknown reason the barking stopped. ;-)
It is amazing how quick dogs understand cause and effect.