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My name is ***** ***** I have been a Vet tech for 30+ years with special interest in Reptiles and Reptile Rescue.
Can yo tell me what state you are in?
Did you happen to get a picture of the snake?
Please give me a few minutes to research and see if I can identify the snake you had seen.
Did the snake look anything like this one: http://www.snakesofarizona.com/rosy_boaplomosa_mountains.htm there may be some coloration difference,
let me get another picture for you. there are so many snakes in the area, but wanted to rule that one out because that one is a constrictor. It was a Rosey Boa and could injure the cats.
is this more like it? https://en.wikipedia.org/wiki/Glossy_snake#/media/File:Arizona_elegans_occidentalis.jpg
this is tough without having a picture. Have to try to find one snake out of many to match and many look like your description. I can tell you most snakes are constrictors and the size of the snake will determine whether the cats are in danger. If not a constrictor the snake would be venomous. Right now I am looking at non venomous with your description.
We can speak tomorrow with a clear head. Night.
I am afraid I will have to opt out. I have researched snakes and cannot find any that meets the description. Maybe someone else can assist.