Yepper, get him off those alfalfa cubes five minutes ago - lol lol
If you want to add some extra forage for the sake of adding forage, give your horse timothy pellets or straight timothy cubes, if you can find them.
If the alfalfa was for more energy, and your Paint is not over weight, try adding equine rice barn. It provides horses with a cool energy without making nutcases out of them. It is also for weight gain, however.
I have a horse with food intolerances and alfalfa is one of the things that makes him crazy
He is also oat & corn intolerant but the thing that drives him to really have murder in his eyes is soy - lol loll ol
When y 25 yr old was a Youngin' he could not handle alfalfa. He literally would stand straight up and climb his stall walls - and that was only being shut in for the night
Now that he is 25 and equine metabolic syndrome has caused him to lose muscle mass, I feed him one pound daily of timothy/alfalfa cubes and he does fine. It's given him back some stamina the EMS stole from him.