This has been making the rounds of the training community for a while, I don't know who the author is, but it bears repeating:
Obesity is a leading factor among many of the pet dogs that are brought to us with behavioral problems. And with almost equal regularity their humans express surprise and disbelief. If you touch your dog's ribcage gently with your fingertips and you cannot easily feel ribs, there's a pretty good chance your dog is overweight. If your dog does not have a visible waist looking from above or a clear abdominal tuck viewed from the side, there's a pretty good chance your dog is overweight.
Is your dog not motivated by food? Read on, please.
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Sometimes (a lot of times) when people bring their dog for training it's because the dog is not doing what the human wants.
Does the dog understand the desired behavior? Is the dog able to produce the desired behavior? Can the dog associate the behavior with the command? Does the desired behavior earn a better reward than other options?
If you were offered a job that payed better, payed more often, had better working conditions, greater chances for success, and more interesting and meaningful work, wouldn't you take it? And what if you were paid in cash?
At a job site some years ago I met someone with two Border Collies who were frantic. They were running around as though they were having an anxiety attack, looking for anything they could make move. The first time I saw them focus on anything was when an airplane flew past. And the dogs tried to herd it, too. The fact that the airplane did not comply with their direction appeared to add to their distress.
I asked the owner what was happening and he replied, "Oh, that's just the way they are, they're a little crazy."