chimerisim: - http://messybeast.com/mosaicism6.htm (main source) - https://meowtel.com/blog/post/all-about-chimera-cats - https://www.purina.co.uk/find-a-pet/articles/cat-types/breed-guides/chimera-cats#:~:text=Issues%20associated%20with%20the%20XXY,much%20love%20as%20the%20rest! stiff gait: - https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub/symptoms/limping-and-stiffness-in-cats#:~:text=Limping%20and%20stiffness%20in%20cats%20can%20be%20caused%20by%3A,Sprains%2C%20minor%20injuries%20and%20Wounds weakened bones: - https://www.merckvetmanual.com/cat-owners/bone,-joint,-and-muscle-disorders-of-cats/bone-disorders-in-cats - https://www.msdvetmanual.com/cat-owners/bone,-joint,-and-muscle-disorders-of-cats/disorders-associated-with-calcium,-phosphorus,-and-vitamin-d-in-cats#Adult-Rickets-(Osteomalacia)_v3245495 lameness: - https://vetsoftherockies.com/education/cat-limping-possible-causes-and-what-to-do/#:~:text=If%20you%20notice%20your%20cat,being%20hit%20by%20a%20car. - https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub/symptoms/limping-and-stiffness-in-cats#:~:text=Limping%20and%20stiffness%20in%20cats%20can%20be%20caused%20by%3A,Sprains%2C%20minor%20injuries%20and%20Wounds weakened immune system: - https://www.msdvetmanual.com/cat-owners/immune-disorders-of-cats/immune-deficiency-diseases-in-cats - https://vcahospitals.com/know-your-pet/autoimmune-skin-disease-in-cats + my common knowledge since i have it myself! :)