It looks like two puncture wounds from the animal's fangs.
If your dog is bitten by a snake, there may be no cause for concern, as the majority of snakes are nonpoisonous. The bites of harmless snakes show teeth marks in the shape of a horseshoe, but there are no fang marks. The bite from harmful / venemous snakes will have two puncture wounds in the skin (fang marks). My mom was bit by a snake on her ankle once. If you looked closely, you could see 2 fang marks (2 holes side by side). Regardless of whether the dog was bit by a snake, it sounds like he's having a reaction to something. If it's a severe allergy to something you want to find out exactly what it is. Even a bite from a harmless snake can be serious, leading to an allergic reaction or an infection. Venomous snake bites can produce an array of symptoms, including localized pain and swelling, convulsions, and nausea—even paralysis. There are first aid steps you can take after a snake bite occurs, such as cleaning the wound, remaining calm, and immobilizing the affected area. However, it is essential to get the bite victim to a medical facility immediately for emergency treatment. If treated in time, the outlook for recovery is good Learn about snake bites. When a non-venomous snake bites, the biggest concern is infection and tissue swelling. When venomous snakes bite, in addition to tissue damage and infection, the concern is the effects of the snake venom. Most snakes will not bite unless they are disturbed or handled by people. Immobilize and support the area of the bite. Do not apply a tourniquet but do restrict movement in the bitten area. Also keep the area at or below the level of your heart. This will help make sure that if it was a venomous snake the spread of the venom is slowed down. A snakebite is an injury caused by the bite of a snake. It often results in two puncture wounds from the animal's fangs. Sometimes poisoning from the bite may occur. This may result in redness, swelling, and severe pain at the area, which may take up to an hour to appear.  Venomous snake bites. 1  Venomous snake bites are very rare in the UK and are most commonly the result of an adder bite. 2  Venomous snakes, even when they bite, do not always inject venom or sufficient venom to cause envenomation. 1 Venomous snake bites are very rare in the UK and are most commonly the result of an adder bite. 2  Venomous snakes, even when they bite, do not always inject venom or sufficient venom to cause envenomation. Visible Bite Signs. If your dog receives a snakebite, the likely site will be the head, neck or limbs. You may notice your dog trying to lick the area, as it produces pain and blood. If the snake was poisonous, look for fang marks. A full bite will show two close punctures, though a single puncture is possible if the snake was unable to get a direct strike. A venomous (poisonous) snake bite is a bite or a puncture wound made by a snake that is capable of injecting, secreting, or spitting a toxin into the penetrated skin wound or, mucus membranes or the eyes where the toxin can be absorbed. In North America, there are about 25 species of snakes able to secrete toxin. This should be distinguished from a dry bite. A dry bite is a bite by a venomous snake that does not inject any toxin. Even bites that are from a nonvenomous snake or are dry need to be evaluated as they can lead to significant tissue damage or infections. What a Snake Bite Looks Like on a Dog. A venomous snakebite will show fang mark punctures on your dog. John Foxx/Stockbyte/Getty Images. Your dog is a curious creature who loves to sniff out new experiences and friends. Unfortunately, that curious nature can get your pooch into trouble if he encounters a poisonous snake. You may notice your dog trying to lick the area, as it produces pain and blood. If the snake was poisonous, look for fang marks. A full bite will show two close punctures, though a single puncture is possible if the snake was unable to get a direct strike.
https://answers.yahoo.com/question/index?qid=20070430111818AAP0Jml http://www.healthline.com/health/snake-bites http://www.wikihow.com/Treat-a-Snake-Bite https://en.wikipedia.org/wiki/Snakebite http://patient.info/doctor/Snake-Bites http://dogcare.dailypuppy.com/snake-bite-looks-like-dog-5058.html http://www.medicinenet.com/snake_bite/article.htm http://dogcare.dailypuppy.com/snake-bite-looks-like-dog-5058.html
what does a snake bite look like