I Saw an Add For a Dog

Sounds like someone trying to pass a mutt off as a pure bred or designer dog.. Eck..

But no I've never heard of a fox red lab.. Lol. 

There's no such thing as a "red fox lab". BYB's use this term, like "white labs" or "white goldens" or "silver labs" to entice people into thinking the dog is rare- it isn't. The "red fox" color is just a darker yellow lab, or a lighter chocolate lab.

The three Labrador colors are yellow, black, and chocolate.

BlackLabbie

...The "red fox" color is just a darker yellow lab, or a lighter chocolate lab...

 Fox red is techinally a very dark yellow Lab, not a light chocolate.   "Silver" Labs are a dilute chocolate (purebred Labs, notthose not mixed with Weim).  The AKC standard actually makes refgerence to fox red, and cream, as shadings of yellow.  The section of the AKC's standard on Lab colors:

Color
The Labrador Retriever coat colors are black, yellow and chocolate. Any other color or a combination of colors is a disqualification. A small white spot on the chest is permissible, but not desirable. White hairs from aging or scarring are not to be misinterpreted as brindling. Black--Blacks are all black. A black with brindle markings or a black with tan markings is a disqualification. Yellow--Yellows may range in color from fox-red to light cream, with variations in shading on the ears, back, and underparts of the dog. Chocolate--Chocolates can vary in shade from light to dark chocolate. Chocolate with brindle or tan markings is a disqualification.

Picture I found on Google. Good looking dog.