How to Tell if a Snake is Venomous

Reader Contribution by Renee Benoit
Updated on January 13, 2025
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by Adobestock/Charles

So, I’m out in the dog pen this morning. We have a big dog pen so the dogs have a safe place to get exercise and shelter from monsoon thunderstorms. It’s 35 feet by 85 feet and has a lovely grape arbor in the middle. It’s also completely fenced with chicken and goat wire. Weeds would take over if I didn’t clear along the perimeter and mulch the middle.

So, I’m merrily chopping away and that’s when I see her – a 3-foot-long Sonoran gopher snake. She’s working her way away from me through the tall weeds. What a beauty! I’m glad she’s here because she keeps the rodent population down which makes it less attractive to venomous snakes with reduced food availability. Earlier in the season we were very happy to see a Desert King snake in the grape arbor. That is another beauty that actually kills and eats venomous snakes.

I’d rather not accidentally come across a Mojave or a Western Diamondback. We have them here in southeastern Arizona. The Western Diamondback back accounts for most of the local bites that put people in the hospital. The Mojave is even more dangerous but fortunately is not as common.

So, I’m happy to see the gopher and king snakes. Ever since we moved away from the city years ago and into the country it’s been an interesting education concerning snakes. When we lived on the slopes of the Mendocino National Forest in Northern California we had our share of snake encounters. When we first moved there we had our dogs vaccinated against bites and it was a good thing, too. Our chow mix lived to chase ground squirrels and spent most of this day running pell mell, up and down hills chasing the wily critters. And because we had so many ground squirrels, we also had our fair share of Northern Pacific rattlesnakes. One day our chow was bitten. He came in limping with a big swollen leg and I immediately suspected snake bite. We took him to the vet right away and after sedation and shaving there were the telltale twin fang marks on his lower leg. He survived. The antivenom buys time to get to the vet and with our experienced vet’s care he recovered quickly.

We must have dispatched more than 60 rattlesnakes near our house over the course of our four years there. We could have relocated them if we felt up to it but we didn’t. That’s for an expert handler to do and they would have come back anyway. The owner of the ranch even had us buy a flock of guinea hens which were supposed to be snake early warning devices with their racket. Unfortunately, they quickly became bobcat food and that experiment failed.

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