So sorry to hear about your beloved pet. Our two dogs just died of kidney failure. One in February (he was 5) on in March (he was 13 month).
Both went into the vet with backpain and died a few days later of kidney failure. Both dogs were treated with "Metacam" which can cause kidney failure. We are not sure, if the can food (which they only got as a treat once a week) or the meds were causing the kidney failure. Hard to proof, but
we heard that the petfood recall was started in February, but the food was already tainted as early as December, without the general public knowing anything about it.
The are a few class action lawsuits already started in the United States and in Canada.
Our vet told us if the kidneys are failing, it is very hard to get the pets back to life.
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I know, what you are going through and wish you all the best.
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If you like me to find you the links for the lawsuits, let me know and I will find it for you.