My elderly dog had an op a few days ago and had a large tumour removed. He is recovering well - eating, drinking and enjoying his walks - but today, which is 3 days post op, I notice he has a large swelling on each side of his neck, one bigger than the other. They feel soft and not attached to the bone. Is this related to the operation?
The vet did say that there were no signs of tumour in the liver, but possible indications of something in the lymph gland. But this swelling came up overnight, so it can't be tumour can it?