Welcome to the list! Mr. Kitten sounds like he has a good mom. I think many vets just refuse to learn new things. Just out of curiosity, has the vet that told you to euthanise Mr. Kitten ever given him any vaccines? If so, can you tell me where he gave them (neck, scruff, side, leg)? I ask because if he's still giving vaccines in the scruff of the neck, he's obviously just someone who refuses to embrace new technology and studies and is just a bad vet for not continuing to work on his education. The most important thing is to feed the very best quality food you can afford, like Wellness, Innova, Chicken Soup, or other super-premium brands. Cat food should never contain corn or corn ingredients. After that, then you start adding general immune boosting supplements (same as you would take to boost YOUR immune system) like Vitamin C, Lysine, B Complex Vitamins, etc. Then you consider adding a FELV specific treatment, like Interferon, Acemannan, or Immunoregulin. Lots of it is just plain good nutrition, and I don't think any vet could argue with adding extra immune boosting vitamins and minerals to an animal's diet!
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