I took my 2 year old orange tabby to the vet a few days ago because he has been limping a lot lately. They took an x ray and said he has luxating patella on both back knees. His left is a lot worse than his right. The vet told me he would need surgery but he had to lose weight first (he's 22 1/2 lbs). I switched his diet to wet food after doing research for the best and safest way for him to lose weight. He's been on the new diet for 2 days now he likes the new wet food but does not eat nearly enough of it. I give him 6 oz of wet food though out the day and 1/3 cup of dry food at night. It worries me that he is not eating as much as I thought he would. Before the diet I would leave dry food out all day and let him eat as he wanted, but I have 3 other cats so I didn't know how much anyone ate. Is this normal for my cat to not be eating as much as he should now that I'm monitoring what he eats. And he cannot get to the other cats food. Please help