Best Friends does seem to have the best data available on this topic!
But one thing to keep in mind is that Best Friends only gets data from about 3,200 shelters in the US (and shelters aren't required to report or publicly share this information).
You should also know that litters of neonatal kittens are often counted as "one unit" when euthanized (so the report would only show one euthanasia for a group of X kittens) and unfortunately, depending on the area/resources available to the shelter, they can make up a large percentage of euthanized animals.
I'm not sure if that data makes sense to include somewhere in your page :) but 800,000 is misleading, in my opinion.
#DataandTechnology