Updated On April 14th, 2017
Pet's info: Dog | Labrador Retriever | Male | unneutered | 1 year and 2 months old | 70 lbs
Answered By Jennifer Summerfield, DVM CPDT-KA 103
Veterinarian, Certified Dog Trainer
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Poor Casper! I'm sorry to hear that he's injured. Without being able to examine him, I'm afraid it's hard to say what might be wrong. You're correct that the swelling could certainly be due to a snake bite. Other possibilities would include an insect bite or sting, a fractured bone in his paw or leg, an infected wound or abscess, or some other type of injury. Many of these problems can be quite serious and even life-threatening, so I would recommend taking Casper to an emergency vet tonight for treatment. The vet can examine his leg, and may also take x-rays or do other testing if needed to determine what's wrong and get him started on appropriate treatment.
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