1) Poor diet (Canned versus raw)
Raw food is essentially much more natural in terms of nutrients and vitamins. It is also easier to be digested. Raw food increases the enzymatic activities in the gut and bowel making pets look and feel health. Raw food also helps to strengthen the immune systems making it more resistance to infectious diseases.
Raw food diets prompted animals to eat less. The higher amount of mineral salts in a raw-food diet satisfies an animal's hunger better than does cooked or canned food.
2) Vaccinations
Certain vets insists that some type of vaccines are necessary pointing out that laws mandate that pets are to be immunized. However some vets also responded by labelling all vaccines as 'poisons to an animal's immune system'. Animals were created with inbuilt immune systems, therefore any additional chemicals will or might affect their already properly set-up system.
However, if there are certain reasons that requires the pets to be vaccinated if cases of disease or illness it is more than necessary to do so.
3) Inbreeding
Recent history of cosmetics breeding practises among cat and dog breeders is replete with bad news from animals and gross deformities, lost instincts, altered and bizarre behaviour to specific health problems.
While it is true that the alley cat or junkyard dog may never win any awards at pet shows, they will thrive a lot better than those pampered pets with papered pedigrees a mile long.