Or perhaps my idea of negligence differs from that of others. Crushing a dogs knees and hips with obesity is to me, not taking very good care of the dog. Yes the action may be out of love, but it still hurts them. Letting an ear infection go on forever in a dog untreated is to me, negligent. Letting dogs live with broken, rotting teeth is to me, negligent.
All of those things can be well hidden on dogs to the average eye, and those same dogs may be coddled in other areas, but it doesn't stop the pain, and some of those things will shorten the dog's lifespan. It's really sad for me to hear an owner telling me that 7 years is an average lifespan for a beagle when that just isn't true.
Edited to add: I do think a distinction needs to be made between "Not caring about" and "not taking good care of" their dogs. To me good care includes providing food, water and shelter, keeping the dog at least in a reasonable weight, taking care of basic grooming (whether that is a brush and home nail trim or visiting a salon), taking care of the medical and dental needs of the dog, and giving it attention and training.
Most people
do love their dogs. They
do provide food, water and shelter. Most people don't do well on the weight issue:
http://www.petobesityprevention.org/
Or on the teeth issues. (Over 70% of dogs have periodontal disease, and most of them need to see a vet for it.)
Or on a whole host of non-life-threatening medical issues. (This is why vets send you so many reminder notices)