Dog spleen shows dark on ultrasound -what treatments can be done to correct spleen?

Now it's a year later and the vet says she can feel that his spleen is enlarged but does not feel any lumps. Two weeks ago I fertilized my lawn and watched as best I could to make sure he didn't eat the grass. I caught him a couple times and he is starting to lay down a little more than normal and then the vet gave him a rabies shot which made him more tired. He has bounced back a little but I would really like to try vitamin K but not sure how much to give him... He is 59 pounds. Can anyone tell me how much? Can I feed him spinach, he likes it raw."

http://www.dogkennelsoutlet.co.uk/

http://www.chickencoopsoutlet.co.uk/

http://www.rabbitrunsandhutches.co.uk/