Electrolytes does not stop acidoses once it has taken hold, the dog needs a vet quick and to be put on a drip!
However, it can prevent it, if your dog is fit before a good run.
Given before and after hard running, it does help, if the dog as said, fit.
Nights out lamping big numbers, a rest now and then, with a small drink of electrolytes, helps a lot.
This is my experience on the matter.
WC, good point, about the breeding in dogs.