We have lots of them here MadDog.
I know those Western and Eastern Diamondbacks get HUGE, maybe bigger than the Timber rattlesnake, but I wouldn't want any rattler to get me or my dog. We have several species out here in California that overlap territory. Diamondbacks, Mojave Greens, Souther Pacific rattlers, Sidewinders and a couple others I can't remember. I've had to kill several 5' to 6' ones on my property. Can't risk having them around to get my wife, dog or 9 year old son. (Yes I have a 9 year old...2nd marriage surprise and I should be his grandpa) /forums/images/graemlins/smile.gif
There's a program on called Venom ER on animal planet. It's all about snake bites here in So CA. The doctor in it can recognize what snake bit you by the symptoms of the poison. They have different effects. It's scary to think about but we watch it all the time.
I contacted my local Vet here and he could not get me any rattlesnake vaccine for my dog, so I took her to the training program. Learn something new everyday. Here's a picture of a pretty big diamondback. This is not me, it's a picture I found on the net from some guy in Texas, I think. How would you like to run into THAT one?