hi. i'd like some advice on 2 points 
my dog got a nasty cut on a paw pad whilst out with his dog walker. we had to take him to the vet twice (with a total bill of £80).
6 days on, the wound is still gaping open although it looks clean and dry. we bandage it when we let him out in garden / take him down the road but he's not been on a proper walk since it happened.
i am concerned that the egdes of the wound should have healed back together by now and wondered if anyone has advice on this.
the second point concerns the dog walker. she is a pleasant girl with experience of dog training and the dog loves her to bits. but... although she texted me to tell me he was lame, she failed to notice this very obvious wound. (similarly a couple of months back, got another text to say he was lame, but she failed to notice a large thorn in this paw).
i do realise that this injury couldve happened at any time, but he definitely gets more 'roughed up' on walks with her due to over exuberance/ number of dogs in her care.
so.. i'd like some generally feedback on whether she has been a bit negligent re the paw. 
also, what about liability for vets fees- would you expect a dog walker to be covered for accidents in their care? (need to check if we have an to date policy, but pretty sure our puppy policy didnt get renewed)
thanks for any advice.