There must be an emergency 24h vet it doesn't have to be your regular one i would take him just in case-it is something that would really worry me
Here are listings for emergency vets in Philippines http://www.vetworld.com/vetworld/philippines.html
This info is from another website
The most obvious sign of an electrical injury is burns in or around your dog's mouth. If either the whiskers or the hair surrounding the mouth are singed, this can be an indication that your dog has been burned at some point. The majority of serious symtoms are related to your dog's breathing, shortness of breath being the most common. Non-respiratory indicators are rapid heart rate (tachycardia), muscle tremors, seizures, and physical collapse.Some of the most common signs of serious electrical injury are:
Abnormally fast breathing (tachypnea)
Needing to be upright to breathe properly (orthopnea)
Crackling sounds in the lungs (rales)
Difficulty breathing (dyspnea)
Bluish-tinged skin (cyanosis)
The symptoms listed above can be due to an electrical cord injury, but there are other possibilities as well. Issues in the heart, such as an irregular heart rate, could be due to an existing heart disease. Electrocardiogram (ECG, or EKG) recording can be used to examine the electrical currents in the heart muscles, and may reveal any abnormalities in cardiac electrical conduction (which underlies the heartís ability to contract/beat). This will enable your veterinarian to confirm or rule out heart disease. Heart problems can also occur if your dog has ingested rodent poison. The poison used to kill rodents contains anticoagulants which block the production of vitamin K -- necessary for the clotting agents found in the blood to work normally. This possibility can be ruled out through blood coagulation testing.
Generally with electrical cord injuries the lungs are filled with a pink, foamy fluid. There are often tan or gray wounds in the mouth, and areas with red spots inside the heart lining.