“Scientists Discover That Dogs Cry Tears of Joy When Reunited With Owners” https://futurism.com/the-byte/dogs-cry-tears-joy-owners
“Published in the Current Biology journal, this study by Japanese researchers found not only that dogs shed happy tears, but also that the love hormone oxytocin — the same one that causes humans to feel emotional bonds with each other and with animals — may be underlying that mechanism.”
Eideard 
“Scientists Discover That Dogs Cry Tears of Joy When Reunited With Owners” https://futurism.com/the-byte/dogs-cry-tears-joy-owners
“Published in the Current Biology journal, this study by Japanese researchers found not only that dogs shed happy tears, but also that the love hormone oxytocin — the same one that causes humans to feel emotional bonds with each other and with animals — may be underlying that mechanism.”
7AM MDT, tomorrow morning, 24th