They were play fighting (amicably, tails up and wagging gaily, much theatrics and exaggerated movements). Then Dog 1 fell awkwardly onto dog 2's neck with her whole body weight. I should say that I suspect dog 2 has some arthritic / inflammatory issues as he is stiff on getting up after rest. He is 6. He yelped and bit dog 1 as a reflex reaction. No anger or aggression there - just an unfortunate turn of events. Both dogs separated, looking shocked but were fine with each other within minutes. However dog 1 (the faller) has a puncture wound to her lip. Its barely bled - I didn't notice it straight away. I have bathed with hibiscrub solution. Do I need to take her to the vet for stitches? - it doesn't look very deep.
I am hesitating because the vet has previous for over treating (imho), and I have previous for over reacting and seeking vet treatment when perhaps others would manage a situation at home