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Hello and welcome. My name is ***** ***** I'm a biologist with a special interest in canine health. I'm sorry to hear Mac is having this problem. Some additional information will be useful. What type of infection did he have six months ago, and how was it treated? Is the swollen area under his chin and on both sides? Are there any other symptoms, such as appetite loss or lethargy? Thank you.
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There are two common causes of swollen lymph glands in dogs. One is infection. Usually the lymph glands closest to the site of infection will swell. With swelling of the glands in the neck, infection is likely to be present in the throat or in an abscessed tooth. If an infection is causing your dog's throat to be sore, he would lose his appetite. Lethargy is common with any infection. However, the infection 6 months ago probably is not responsible for this swelling since it was treated with antibiotics. This could be a new infection. Lymphoma -cancer of the lymph glands- is the other common cause of swollen glands. Even if that is what this turns out to be, cancer treatment in dogs has progressed a great deal in the last few years. You can read more about swollen glands at this site:
Because this has the potential to be serious, you will need veterinary treatment regardless of whether your dog has an infection or lymphoma. A vet will need to examine Mac to determine what is wrong, and how best to treat it. If you have more questions, let me know in a REPLY. I hope Mac will have a simple infection that can be easily treated.
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Hello again. I'm just checking on your dog. Have you been able to see your vet yet?