Is my ex liable for a dog bite our daughter got when she was with him?

If this was a one-time thing then there is probably not much you can do about it because accidents happen and he may have had no way of knowing that the dog would bite.  If he has a consistent pattern of negligence, however, then you may want to consider seeking to reduce his visitation or have it supervised.  If you are asking about him covering the cost of medical treatment, that would seem fair, if it is not covered by insurance, although the division of medical costs is usually dictated by any child support order you have. This answer is given in accordance with the laws of Virginia and may not be applicable in any other state.  It should not be construed as legal advice, as that would require a more thorough analysis of all of the facts involved in a specific case.  If you need further information or assistance, please feel free to contact my office for a consultation. Case results depend upon a variety of factors unique to each case. Case results do not guarantee or predict a similar result in any future case.