Thanks for the additional information. It is helpful.
It could be two different things. One could be abnormal behavior as the result of there being a female in heat nearby. Male dogs will often stop eating or seriously reduce the amount they are eating. They will whine and want to get to the female. They will often dry hump or walk hunched and even drip a little. Sometimes they even drip a little blood. So you might want to take a walk to your neighbors to see if their female is in heat. If she is, perhaps you could keep him inside more and spray some febreeze around the doorways and windows to cut down on the odor. We can't smell it but he will be able to.
If she is not in heat, then he may have a urinary tract infection. Common symptoms of a urinary tract infection are frequent urination, dribbling urine, blood in the urine, frequent urination, strong odor to the urine, inappropriate urination and straining to urinate as well as an increase in fluid intake.
A dog with a UTI does not always show all the symptoms and typically displays 2 or 3. You have one symptom which is dribbling possible urine but I don't know if he has other symptoms. His hunched posture could also indicate abdominal pain which he might have if he has a UTI or crystals in the urine. So if she isn't in heat, I'd have him seen by your vet to look for abdominal pain possibly related to a kidney issue.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.