I personally would not want my dog on furosemide for SM, and I'd certainly not want to prematurely add an ACE-I simply to compensate for the furosemide for a dog that is in the early stages of MVD. Since cimetidine and omeprazole are also drugs given to reduce CSF, I would opt for one of those drugs and not use the furosemide. I also know what furosemide does to kidney function, so I would not use that drug long term unless it was necessary to control symptoms of CHF.
All of this is of course my own opinion, but I feel somewhat vindicated that Simon Swift has voiced the concerns that I've had for a long time about this drug in the SM treatment protocol. I've also not been happy with the monitoring recommendation for dogs on this drug - I'd monitor much more aggressively.
Brian - would you consider talking with the neurologist about using one of the other drugs that is reported to reduce CSF and just skip the furosemide and the ACE-I? Then you would start those drugs when necessary for CHF from MVD, but that may well be years down the road.