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Please ask your vet if they can try melatonin for your dog. Given that your vet is recommending putting your dog down, he/she may be open to melatonin. Melatonin is protective of the kidneys and is also helpful for pancreatitis while having a very good safety profile. The main problem is that most studies are rodent studies and dog studies are likely to be rare or non-existent so you only have the rodent or human studies to go from. Dogs can take melatonin, but your veterinarian will have to determine the dose. For such a small dog, you may be looking at the area of one or two milligrams or maybe even less. Here are a few studies which discuss melatonin:
https://www.karger.com/Article/FullText/453164
https://www.ncbi.nlm.nih.gov/pubmed/27830885
http://www.jpp.krakow.pl/journal/archive/06_16/pdf/411_06_16_article.pdf
https://www.ncbi.nlm.nih.gov/pubmed/29089475
https://www.ncbi.nlm.nih.gov/pubmed/28854709
Good luck with your dog, Bea!
Art
