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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help with Marley today.
Did Marley have any obvious wounds to his neck? Bites or scratches?
Does the swelling seem hot or painful? Any discharge from it?
Has he shown any signs of vomiting?
Are you able to take a picture of the swelling? Does he seem to be having any trouble swallowing?
I`m just a little concerned he may have an abscess on his neck causing the swelling. This could result from a cat bite and could be making him uncomfortable and feel unwell. If this is the case it is likely to need antibiotic treatment.