Yes we do have timber rattlers (crotalus horridus). Back when I lived in Ga. we had "canebrake rattlers" a relative of the timber rattler. They are different and relatively easy to recognise. They get extremely large, are becoming increasingly toxic - scientists are not sure why - and we had them all over the yard and on the porch. My dog got bitten by a copperhead; she was a large dog and survived. Had it been a canebrake she would have died in minutes.