All that they really accomplish by trying to scare you is filling you with a lack of trust and loyalty towards them. Most large companies are full of drivers that have hit bridges, rolled JD Truck Training Centre, been late for deliveries, and on and on. Does this mean you won't ever get fired? Certainly not. I've been fired a few times by idiots I've never met on some committee making decisions based on little or no real facts or understanding about me or my situation.
Many of the better private schools will have a wide range of training including several weeks of practice at backing up the truck, classroom coverage of everything from log books to maps and routing to air brakes and vehicle inspection. They will also have several weeks of training out on the local roadways. Make sure they will give you the necessary training to get ALL of your endorsements including hazmat, tankers, doubles and triples, and people (buses). Make sure you get ALL of these. It only requires a very short written test and can also severely limit your job opportunities if you leave them out.
When the issue of money is resolved, it's time to decide if the desired school's location will be a good fit for your current situation (i.e. single or married with a family). Are you going to commute daily? If so, how far? Gas can get very costly! Or, are you going to move to attend your choice of Truck driving school? If so, where are you going to reside and at what cost? Some truck driving schools do offer dorms similar to a college campus; but it will obviously raise the cost of attending the institution.
You must be a U.S. citizen, speak English, and have a valid copyright from the state in which you reside. In addition, you must be at least 21 years old to drive across state lines. Some trucking companies will hire 18 year olds to drive within a state.
The best way to learn the CDL requirements is training. There are many truck driving schools available not to mention there are trucking companies that have their own HR Truck Licence driving schools. Some trucking companies will pay you for your schooling if you agree to stay in with them for a Truck licence period of time.
Whether you're a commercial truck driver or owner of a company involved in the delivery of products through the use of trucks, you are responsible for checking regularly the condition of the tires. Doing routine inspections will help you determine problems early on. Ideally, doing a monthly check of your tires will do but you should also be observant particularly if your tires become lower than normal.
So, doubtless you are convinced that dog training is critical and there is no time like the present. After you research your dog training options, get started and have fun. Take my word for it, a trained dog is much more fun than a jumping, slobbering mess. My dog was an honor graduate of his courses and just a test shy of becoming a therapy dog and he's still a jumping, slobbering mess, but that's another story entirely...