
As said the chemist also from the vet. I buy mine on line. It is so useful in a case like this, make a fresh batch in a small bowl every morning and then use a cotton wool ball dip it in bath the area and throw the ball away but leave the bowl of wash for the next time the dog goes out. Think a boot whilst out is the best of both worlds, if the wound is deep then you may need to cover but if it is a graze then best no to as the dog will help you keep it clean and things heal best without being covered.
As it happens we are running a Canine First Aid seminar soon it will be interesting to see what the lecturer suggests for such matters providing I am not shut in the kitchen washing up which is likely.