This is quite common in our area, we were given advise on it from our vet:
Put YOUR not your pets, name on the collar tag
If anyone takes an unusual interest in your dog, tell them they have liver/kidney problems and complain about the vet bills
If you have a bitch, say she is spayed
Have your dog tattooed (excuse my spelling there!) or microchipped
If the dog goes missing offer a reward

They take un-fixed pedigree dogs & breed them, then sell them, its so sad. I think its disgusting that people do that.

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29th July is cassies due date (: