Hi , I'm James DVM MRCVS and would like to help you with your question
when did it happen?
if you are suspicious of such a thing happening then the first thing you must do is contact your vet so he or she can take an Xray of your dog's abdomen to see if the battery is there .
If it is there then it will need to be taken out surgically as batteries contain very strong acids and other chemicals and heavy metals .
But as I said , your first port of call is to take an Xray at your vet .
I hope this helps .
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