If you’re worried that your dog might be dehydrated, one of the tests you can
do is to pull up the skin on their back and it should
ping back straight away. If it doesn’t, that could be
a sign that they’re in shock or that they have become dehydrated. If you do that on the back of the neck, it won’t ping back
immediately because dogs have excess skin on the back of the neck, so it’s on their back
that you would do that. But again there are
obviously additional signs to a dog being in shock to just that.