How convenient that only your google searches count.
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If you put the direct question" Does furosemide affect the liver?"...hopefully the answer won't come up behind a subscription wall......it says 'furosemide can cause very low electrolyte levels, which can cause serious liver damage and loss of brain function"......makes sense to me.
Can I prove anything? ....no of course not......I'm certain even an autopsy wouldn't prove much.....certainly not for you.
The problems around diuretics and the liver seems to be more around electrolyte imbalance and what happen when horses are treated with corticosteroids in conjunction with potent diuretics like Lasix.
That's the extent of it for me so unless you can pull out a medical qualification, I won't be changing my mind 
I'm sure there would be people at Waikato Stud suspicious of the cause of the stallion's liver problem as well.
You are the one making the allegations (almost certainly false) that Chris Waller was using Lasix on his horse and that the death of Sacred Falls is due to your own diagnosis of Furosemide toxicity.
You don't come up with one shred of corroborating evidence.
Then you turn around and ask me to produce qualifications.
10/10 for social media trolling
The side effect of electrolyte imbalance is a short term effect due to the loss of fluid - which is what the drug is all about if you knew anything.
I have not professed to expertise in the field of pharmacology (my expertise lies in Radiology - or laid, I am retired from the game) but I probably know more than the lay person.
Glomerular filtration and tubular secretion mechanisms, the way that the body excretes the drug, is known to me because of the requirement to understand the pharmacology of contrast media and how it is expunged from the body.
Many a patient with Pulmonary Oedema has fluid on the thoracic cavity, seen quite clearly on X-ray, and the treatment of choice for most patients is Lasix.
There are long term side effects of the drug, but only with continual use - principally the kidneys.
However I do not profess a knowledge of the physiology of the horse and in particular equine hepatic anatomy and physiology.
I certainly don't come on forums as an anonymous poster making all sorts of libelous allegations about someone with not one shred of evidence, quoting Indian web sites and quoting my own "feelings" as some sort of proof.