Hello and Welcome to HCM.
Thank You for your query.
I can completely understand your concern.
Since,your child was scratched by your Dog,I would recommend you to get him a
Tetanus toxoid injection,immediately.
I need you to do take care of the wound by firstly washing the wound thoroughly with soap water,and
savlon,and thereby applying Betadiene ointment or any other antiseptic cream,twice daily, and keep a close check over the wound,for any pus etc..
Since he's your pet dog,we expect him to be vaccinated to date,so there's no point of worrying on this concern.
The wound would get healed eventually.
Thank You.
Please Hit a THANKS,if this helped you with your query.
Do write back for followup queries,or other doubts.
Good Luck.
Stay Healthy.