If you are not openly listed, every web hosting provider you will come across is a shared provider. It means that the server hosting your website is simultaneously providing service to other websites as well. Tolerating technical constraints like bandwidth, disk space, upload and download speeds, security and privacy, traffic, and perhaps the restrictions as well, are the price you pay for cost effectiveness.
Wanting to have a total control over your website including administration of hardware and software will require you to go for a dedicated hosting provider, not a shared one. If your business is large enough or big enough to require its own internet connection and server, it is a must that you go for a dedicated web hosting company.
What are the issues you can face while going for dedicated web hosting providers? In a nutshell I would say responsibility. In most areas of life, total responsibility means total control only; the same is the case with web hosting.  The responsibility falls on you to buy, install and maintain all the actual equipment - even the server - which is to be mounted in the dedicated data center.
It is fortune to have security provided by them on the physical premises, but what goes on in the cyber one, is your entire job. It will also fall on the shoulders of web hosting providers to ensure a superfluous uninterrupted and back up power and environmental controls, but it is your task to maintain machines and cables functioning in the environment.
How do you know that now it is time to switch from shared to dedicated host provider? There are three main indicators, speed, reliability and customizability.
If your streaming traffic experiences a problem to browse through the website be it a client or in-house employees, it is time to shift from the host provider to a better service provider.  But if you have tried it several ones and the results do not change, make sure it is time for you to shift to a dedicated one. You have to gauge how impatient your average server user is and act accordingly. While you waste your time jumping from one host to the other, it is time for you to change, because your customer has already changed the ship. Saving any buck here is harmful because it will make you lose far too many, if not bucks then trust. You know that you have to respond promptly and quickly to customer queries otherwise they will be lost.
Reliability and security are the chief areas to test the limit of your control. It is not that problems can arise; the fact of the matter is that they do arise, and they are natural to be so. If you do not have unlimited access to your own operating system, software and database etc there is not much you will be able to do about it.
Mind it that if your web hosting company is growing fast, many aspects of your web access is going to be changed as well. You might need to squeeze in your disk space and might even need to use or experiment different applications. On a shared host, however, upgrading is jumping from one plan or package to another only. These packages are pre determined and set and might not serve the purpose for you. They may be stuffed with programmes not required by you and might not exclusively have all what you need.  On the next plan, it is very much possible that you have bandwidth not at all required by you at the moment. With a dedicated server you can make changes the way you wish to, step forward, step back, heck, step sideways or whatever the need is there for.
At large it is the size of your business or use o the website which determines if you nee a dedicated or a shared host. Saving a few bucks and a few extra hours per week will do you no good and no justice to your booming business, if you go for a shared server just for the sake of affordability and personal time commitment. You are providing poor quality to your customers, and then remember to get a bad response.
The same voucher applies to a business which is small and is running smoothly with no or minimum hassle on a shared hosting. There is no need to change it to dedicated server and waste precious capital on nothing just to have total control. Because sometimes total control isn’t what it is crazed up to be.