Hope this is the place for this
Salty scoffs everything from the floor
We live in a house with a large semi-wild garden in Portugal
There are grape vines
We never feed him grapes and try to clean them up since I know that they are not good for them, but grapes do fall to the floor and he is a hoover
'The internet' seems to say one grape will cause instant death (quite literally in many cases) but salty is alive and kicking and in very good health
As ever the internet is full of recycled blogs and things using copy paste and sensationalising to get clicks
However, the ASPCA says, Grapes and Raisins: Although the toxic substance within grapes and raisins is unknown, these fruits can cause kidney failure. Until more information is known about the toxic substance, it is best to avoid feeding grapes and raisins to dogs.'
https://www.aspca.org/pet-care/animal-poison-control/people-foods-avoid-feeding-your-petsI do know that in Portugal there are a LOT of dogs (more per head than in UK IIRC) and a lot of gardens with grapes growing in them ....
Unfortunately, there seemed to be no 'NHS' site for the dog world where I could get sensible info
so, I did some research and found the Veterinary Poisons information service which is great and so I am sharing below (sorry if teaching to suck eggs!)
It seems that some dogs are fine after scoffing loads and others only need one grape to get very serious consequences:
'Not all dogs are affected and the reason for this remains unknown. There is also no apparent dose-response relationship. We have follow up information on over 1000 cases of grape and dried fruit ingestion in dogs but only a small number died or were euthanised.'
https://www.vpisglobal.com/2020/12/02/grapes-and-dried-fruits-christmas-cake-christmas-pudding-and-mince-pies/'Grapes, raisins, currants and sultanas
These cause kidney failure in dogs, and potentially other animals too. The toxic mechanism is not understood and the quantity that can cause problems seems to be very variable. Some dogs have eaten large amounts and developed no effects, while others have gone into kidney failure after ingesting a small number of raisins or grapes. Even ingestion of cooked fruits in fruit cake (e.g. Christmas cake) or Christmas pudding can cause kidney failure.'
https://www.vpisglobal.com/common-poisons/Perhaps the mechanism/ toxin is explained here?
https://www.vpisglobal.com/2021/05/05/cause-of-grape-induced-kidney-injury-in-dogs/Pet poison leaflets:
https://www.vpisglobal.com/flyers-and-leaflets/vpis-poisoning-in-pets-focus-on/