why are the possible reasons that most of the dogs are overweight in recent years

Parallel to the increasing weight of people in recent years, dogs are also getting heavier.
A recent study found that over 50% of dogs are overweight or obese. For both dogs and people too much weight can have negative effects on health.
What factors make it more likely that a dog is overweight?
The study correlated a dog and a weight range of factors in their lives. The goal is to see which factors most relevant to the performance too much weight.
These factors are analyzed old dog, neuter status, diet, length of time of exercise, household income, age and ownership. Dietary habits included questions on how often a dog is fed, what kind of food and if there is an eating table scraps, snacks or treats.
Dogs are assessed for physical condition and classified as underweight, normal weight, overweight and obesity. The standard classification of body shape is used in weight category for each dog to determine.
For 696 dogs, 5.3% were underweight, only 35.3% were normal weight (ideal body shape), 38.9% overweight and 20.4% are obese. This means that almost 60% is considered as a body shape characteristic of carrying too much weight ..
As mentioned earlier found that the dogs are older and / or neutered dogs are more fully than in more ways, castrated female dogs with a higher risk of obesity than castrated dogs.
Other factors that were found in the possibility of a big increase in dog ownership is older, fewer hours per week to exercise, frequent snacks / treats and a lower income person.
Feeding once or twice a day is not related to differences in weight. As expected, the more table scraps and treats more, the higher the likelihood of many roads. The dogs that received the most table scraps are most likely to be obese.
Older owners are more likely to be extremely large dogs. There is no difference in time when the dog is exercised between younger and older owners. It is possible that older owners are usually run slower and so the dog's ability to implement.