I have just collected a 15kg box of chicken carcases for my dog for £9- I was delighted (doesn't take much!) But...have got them home and they are a fozen solid mass! Have phoned the Butcher who told me to defrost them until soft enough to separate and bag up...Is this ok to do? isn't it dangerous? When I asked him he was a bit 'yes, it's for a dog isn't it??' He said it's ok to thaw and re-freeze once...Anyone know?