I just adopted a 12# male dog (chiuaua & shitzu mix) from a shelter. Age 3 ~ 5. The shelter told me the dog had grade 2-3 LP (luxated patella) on both knees. I took him to two different vets. Both vets spent less than 10 seconds of palpating and said definitely grade 4, meaning the patella are always out of their knee grooves. He shows no symptoms. Only when one vet manipulated a leg in a certain way, the dog expressed pain. One vet also said that the dog's showing symptoms of collapsed trachea, which makes him a poor candidate for a surgery. I can return the dog back to the shelter but I don't think I can live with myself since we're already bonded. So I'm trying to learn as much as possible about luxated patella. But everywhere I read says grade 4 LP needs surgical intervention. If any of you know any way I can delay the onset of dog LP deterioration without surgery, please let me know.