Obesity in pets
From Citizendium, the Citizens' Compendium
When it comes to dangerously obese dogs, more than one pet owner has been prosecuted under the law for cruelty to animals. Two British brothers were cited in 2006 for cruelty and neglect of their chocolate labrador, "who was allegedly made so obese by his owners that he 'looked like a seal' and could barely waddle a few steps". Cats have also been found to suffer from morbid obesity.
The reasons for obesity of cats and dogs in wealthier countries is not simply a matter of overfeeding. Lifestyle and hormonal influences also play roles. Pets are now, for their own safety, not allowed to free roam as they did in the past. Also, surgical sterilization of animals does increase the chances of the pet becoming overweight. Neutering of animals is important, not simply to cut down on the tragedy of huge numbers of unwanted cats and dogs, but also because the health of an individual pet is compromised by remaining "entire" but not being in a position to mate and reproduce. Females have higher rates of cancers and other abnormalities of the reproductive tract, and males are more likely to wander widely and suffer trauma from combat with other males, and from accidents.
In some municipalities the answer for dogs has come in the form of dog parks, both public runs and private facilities, in which dogs and people socialize.