BUT...this couple has inherited this house and the man of the family is a born again Christian who has served time for drugs. As we all know, there are many types of born again Christians...some still quite dangerous.
BTW, don’t know if you have kids, but I’m sure your neighbors do. Making them all aware of the new doggie resident is the least a good neighbor can do in this situation.
Drop a dime on your new neighbors...... tell the cops they’re dealing drugs. The cops will show up and shoot the dog for you.
Kind of like the snake owner who thinks their 6 and 8 year old boys can sleep in the same room with the very large and very hungry and stealthy predator snake! Notice how the initial story was that the snake was in the room BELOW the boys, only to find out they lied about that? Regardless, the boys are deader than dead now.
Don’t put yourself in harms way by threatening to shoot the dog or even consider discharging a firearm in a residential neighborhood...you will be the bad guy no matter what the dog does.
There has been good advice offered...develop a paper trail; one-time talk to the owner, and arm yourself with pepper spray or better, hornet and wasp spray. This stuff is better than bear spray...more potent and you can shoot a stream about 25-feet.
I have lost track of the number of near major battles I have gotten into with stupid dog owners. The last round involved .22 cal bird shot and it worked very well.
And I have owned Rotties for 38-years and have never had a neighbor-related problem with my kids.
Good luck