If you buy a large dog breed puppy (Labrador, Rottweiler etc) and you go to one of the many pet shops to buy food, you will be most likely warned by some of the friendly staff to buy to your dog, in addition to food, calcium tablets. Most of the scientists believe that calcium is necessary for young dogs to grow quickly into large and powerful animals.
Calcium can be very bad for dogs, especially for puppies that anyway tend to grow faster. Hip dysplasia and other disorders of the skeletal system, the stones in the urinary system, the more difficult absorption of magnesium and zinc in the intestine are just some of the problems that can be caused by excess calcium.
Unlike adult dogs, puppies of larger dog breeds that tend to grow faster than other dog breeds, do not have an effective system to prevent excessive absorption of calcium in the intestine, which then enters the intestine uncontrollably by the bloodstream which commonly leads to serious health consequences.
On the other hand, you might be asking yourself how is it possible that so many dog generations were raised without any health consequences, while they were at the same time taking calcium tablets. The answer lies in the fact that the addition of calcium needed by dogs that eat pure meat with a few vegetables and grains that are poor in calcium or that east leftovers of human food.
Of course, there are situations when the calcium is necessary to be given to the dogs (to female dogs immediately after they give birth, or to dogs where it was determined by a vet that he needs addition of calcium in his diet).
However, there are substances that are essential to dogs and cats, and certainly they are not found in commercial food. These are primarily Omega 3 and Omega 6 essential fatty acids which are unstable at high temperatures and cannot survive the heat treatment of finished and granulated food. These substances will help your pet to have a healthy scalp and beautiful hair and to cope with itching and other symptoms of allergies.
Also, in the final diet is almost impossible to find glucosamine and chondroitin sulfate that are essential for normal development and maintenance of cartilage.