this is the second dog it's happened to.
Belle seemed a little 'down', not all the time, but often enough to notice.
then during the weekend i noticed her left eye was just a tad weepy, with a little mucus...could have been 'morning eye'
i looked for a foreign body, flushed it, didn't find anything.
could have been the sudden change in the weather, from cold & rainy to Hot & dusty......except for a previous occurence, i would probably ignored it for quite awhile, it was just that minor-looking.
but a few years ago, our Daisy had the same problem, so today i looked long & hard at the big upper molars, and sure enough, one is cracked right up into the gumline.
so, extraction surgery is scheduled for friday.
it is rare, [but not rare enough for me!], for bacteria to enter through the cracked area, which usually results in runaway inflammation of the brain, very difficult to treat.
so if your pup has a weepy eye that doesn't clear with removal of an object/flushing, look hard at the teeth [especially uppers] and get it taken care of!