I wouldnt list it as anything other than a lab mix until you figure out if you have any BSL because a lot of times both chow and akita are considered "aggressive" breeds and its scares the stuffing out of some people and may make it hard to adopt out. When in doubt, list the most noticeable breed and mixed.
I still believe it's akita and lab considering the build of the dog, as well as his short mane and his head shape. Labs arent built like that and chows aren't either. Chows will have some sort of black marking within the mouth even if its on their top palate way way in the back where most people dont stick their eyes. YES its POSSIBLE to not have even a black spot but with the genetic trait being as dominant as it is, it's not PROBABLE to happen.
If a Chow's tongue has a pink spot on it, does that mean it's not purebred? No. Chow puppies' tongues are pink at birth. They darken to blue-black by 8-10 weeks of age. Some tongues don't cover completely and they may have small spots or splashes of pink. Elderly Chows and Chows with the dilute coat colors of cinnamon and blue sometimes lose tongue pigment as they age and develop pink spots. What if the dog looks like a Chow but has a completely pink or mostly pink tongue?
Knowledgeable Chowists agree that such dogs are not purebred Chows and might not have any Chow parentage at all The Chow is a member of the spitz family, a large group of breeds that includes the Samoyed, Siberian Husky, Malamute, Akita, Shiba Inu, Pomeranian, Norwegian Elkhound, Keeshond, etc. They all share basic physical characteristics: a similar body structure, over-the-back tail carriage, upright triangular ears, and a dense offstanding coat. A Chow-looking dog with a pink tongue is more likely to be a mix of one of the other spitz-type breeds.