Heat exhaustion is common in Boxers, they are short nosed(sp) and deep chested....Sometimes you just have to get them to quit playing to cool them down...What I do with Samson who has a lot of issues with heat is take a towel and get it damp with cool water and wrap it around his chest, or take ice cubes and rub it on the chest, or dunk the feet in some cool water..Course the hose is always a good thing to, but mine aren't real fond of water 
They actually make cooling mats that are great to use as well like beds. They excess exercise more than likely upset his tummy and drinking all the water just compounded it...Cours eating a plastic bag might not have helped matters. I would watch him for any side effects from that..
They actually make cooling mats that are great to use as well like beds. They excess exercise more than likely upset his tummy and drinking all the water just compounded it...Cours eating a plastic bag might not have helped matters. I would watch him for any side effects from that..
