1: your talking like an electric fence is like an electric chair...ive been zapped by my fence, dozers been zapped by my fence,the cat and the neighbors dog have been zpped by my fence...
it STINGS, but it leaves no lasting damage (vinegar even in a midl solution in the eyes however stings for a WHOLE lot longer than a quick zap from a low impedence fence)
2: ive known MANY an agressive dog who becomes MORE agressive when sprayed with a squire bottle...theres something about the water that simply arivates them more....
3: being srayed with a squirt bottle can actually become a legal problem, the op would be DIRECTLY HARRASSING the dog by spraying it...if the dogs oners could prve this that then lands the OP in hot water...an electric fence assuming properly marked(signs/yellow hang tags ect) is NOT considered harrasment ect, if the dog (or a person) touches it, it was not the OP's fault...the op squirts the dog hwoever that IS adirect "attack" from the OP.
(assuming a strand of hot wire is LEGAL in the op's area)
a hotwire is a much SAFER means of ensuring the dog stays off the wall and discourages the jumping and would not be consiered harrasment or agitation of the dog by law.
id much rather have my electric fence and known that the neighbors dog HAS been zaped by it and no respects it...than know one day i might actually have to unload a 22 into its skull because its attacking my goats, ducks, geese rabbits or dogs...hes already proven to be hihly dog agressive and ive no doubt hed kill the goats...so if an electric fence means he stays away from my property and i dont have to SHOOT him...then id much rather have him get zapped once or twice....
This dog is also one of those dogs who is simply MORE agrivated by "water" he attacked my fence before the electric and spraying him ith both vinegar water AND a hose pipe simply made him MORE agressive at the fenceline...
since putting in the hot wire, that dog no longer comes anywhere close...Since the op stated they are moving soon this is also a very easy to instal easily removed and EFFECTIVE solution.
And yes AKCK you are right if the dog is actually jumping at the wall you would need a secondwire to ground it as the regular system is only effective if part of the animal is touching the ground at the same time its touching the wire
from what the op described though it seems that the dog isnt actvly "jumping" at the wall but instead standing so his head is onto f the wall and his feet are on the round which on the neighbors side is aparently a few ft higher than the ops side.