I feel sorry for the dogs, and for your daughter. The owners obviously have tried to find a cheap solution to the problem of holiday care for their animals, and have not considered the problems that might arise, either for the dogs, or for your daughter. Your daughter is in danger of being held responsible for the behaviour of the dogs, because she accepted the responsibility of looking after them. She needs to put it in writing to the local council that she is not the owner of the dogs, and does not accept responsibility for the dogs' behaviour. This will, of course, cause bad feeling when the owners return, but it might at least prevent your daughter from finding herself in court over the dogs' behaviour while she is "in charge".