Dogs kenneled in or near old chicken or pigeon coops or in the presence of other large accumulations of bird dung can inhale fungus spores that can cause chronic coughs, bouts of pneumonia, weight loss, undulating fever, and breathing difficulties. (canismajor.com)
More recent GRACE evidence has suggested even larger accumulation events since then. (landscapesandcycles.net)
Maybe it was just large accumulations of dim but familiar objects, like extremely faint red stars or white dwarfs, some astronomers speculated. (discovermagazine.com)