FAYETTEVILLE, Ga. (AP) — Several dogs with burn marks on their backs have shown up in a Georgia county, and no one seems to know how or why they're being injured.

Authorities say that six dogs in recent months have been brought to the Fayetteville Animal Hospital in Fayette County with the burns.

Veterinary technician Erin Meurer tells WAGA-TV (http://bit.ly/1scc6jV) that she doesn't know how the injuries are occurring.

Three of the dogs have been pit bull mixes and the other three have been Rottweilers.

Meurer says concern is growing among some animal rescue groups that these breeds are being targeted.

The Atlanta television station reports that at least two rescue groups, Rotts 'n Pups in Douglasville and Second Chance Rescue NYC, are offering $1,000 each for information in the case.

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