This moment jumped out at me as strangely familiar. The initial reaction by a friend, partner, spouse, etc. in the face of a challenging event can be really difficult.

It's important to try and treat one another with kindness and grace, especially when it's not clear exactly what happened to cause the injury. The frustration clearly came from a place of love for the dog, but I find it hard to to think of how the situation could have been if the text was, 'Hey, I'm really concerned about this cut. Do you know what happened?'

This small word change allows you some extra grace and dignity. The initial message allows for neither.