crighton 3m child?!!! as the others say pets are pretty impulsive ebay buyers too.  with the apps now on iphones I can see how easy it would be for a child who can actally hold a phone to press the minimum bid, when you think they're playing angry birds ...

seriously I guess it depends how much the item is worth as for mutual cancellation / whether to open unpaid item dispute. 

 like all of us I get many unpaying bueyrs - a dispute usually goes unreplied to and you have to wait for it to end, unpaid item strikes seem to do nothing really (they might affect your dashboard).  how many do you need these days b4 your out?

for me it comes down to attitude.  if the buyer is pleasant and seems honest I try to help them out, and you sometimes / often find they may return to buy again (and pay!).