I'd certainly agree. But then, just so, would the biochemical processes required to allow a canine to distinguish between visual objects be complicated, and I don't think you would doubt that canines can distinguish between similar visual objects.
Are you skeptical in earnest of the ability of animals to distinguish between different chemical substances using their chemical senses? It's pretty much a demonstrated fact that animals have highly discriminatory chemical senses, particularly olfactory perception.
Particularly in dogs. I'm not sure anyone has ever tested the ability for a dog to distinguish between different cooked meats by scent and taste, but I'd be just as willing to suppose that they could the same as if we were discussing the dog's ability to see and differentiate objects with their eyes.