The variety of dog foods available in the market is quite enormous and it has become quite easy to find something that would be appropriate for your dog without even having to step out of your home. The thing however is the vast majority of the foods that you see available on online stores or websites of different types are actually filler food types.
These are foods which do not necessarily prove to be healthy as they are just designed to make your dogs feel fuller without actually taking care of their essential nutritional requirements.
So while it is easy to shop online for dog foods, it is recommended that you only proceed through reliable pet food shops that carry stocks of good quality dog foods based on real proteins, especially meat, which is perhaps the main item that you would expect dogs to be fed.
It is necessary to understand that different breeds of dogs will have different requirements of food types which is why it is recommended that you look up food types that are designed for specific dog breeds like Pitbulls. So instead of simply looking for dog foods, it would be better if you can specify which dog type you are looking to shop dog food for.
To elaborate this, you might want to, for example, type in Pitbull food on an online store search engine that retails pet foods in general and dog foods in particular so that you can find the best item that you could be feeding your dog with.