My parents have a pure bred dog and I have a dog of the same breed, also pure bred. My parent's dog is really riddled with health problems, yet mine is pretty much incredibly healthy. We had a mixed breed from a shelter before and the parallels between my own dog and the mixed one we had in terms of health, activity are very similar. I feel like it can be very hit and miss.
My parents' dog was bred for "looks" and has the classic posture expected for the breed, which happens to be shorter legs and a more stocky "round" appearance. This in turn might be why he is constantly dealing with health problems. He has a lot of allergies like >>184366
said. My parents have probably spent thousands of dollars on his health already.
My dog never was bred for "looks" and both of his parents were very fit and agile. He doesn't look anything like the breed is "supposed" to, and so my parents would make fun of him a lot growing up, calling him mutt, etc. But as a result, he has very little health problems I've had to deal with. Behaviour-wise, he is a lot better than my parent's dog as well, and a lot more docile.
tl;dr you might want to do research. if you REALLY want a shiba inu, look into breeders who are responsible and look for health and behaviour as oppose to "looks" and "colors" - I know a lot of shibu breeders in specific will try and cross breed to get certain colours like red, grey, etc. as well as face and facial features and I would stay far away from those types of people.
Another example, in german shepherds they breed the banana leg things, and in chihuahuas they breed for apple head types. Or pugs. Stay away from these people, it is evil what they do. If you look at any Shiba Inu that is healthy and fit, you'll see that most of them don't like the classic caricature of the "doge" type of shiba.
Also I wouldn't recommend a Shiba Inu as a first dog. They're very aggressive and bullheaded. If you want a dog, look for breeds that are more docile. My family's first dog was a mixed breed and one of the breeds was very aggressive like Shibas are, and my parents always had difficulty with training. Also don't get two dogs at the same time.