If his bites are scanned over I would give her the benefit of the doubt and use this as an opportunity to reinforce the importance of communication about things at home that could affect the child in the program - as a partner in child reading you should know a) if the child's been exposed to bug bites and b) suffered the loss of a family pet and grief can affect behaviour, appetite and so forth .... being in the loop about these important life things allows you to be able to properly support the child!!!