They have a cockatiel formula....google it

I just checked website and they still have 3.5 lb and 12 lb. The site defaults to 17 lb, you need to change it. 

We have this at Petco in the 3.5 lb bag. Our sku number on that is 83030 but Petco may have a different item number.

I think it would be fine, this is all my pionus really wants to eat, she is smaller than a Senegal.

My caique solves the problem by dunking every single pellet in his water dish, and then fishing (most of) it out. Maybe if your macaw will accept things you hand feed him, you might try moistening a pellet in water (or maybe even juice, if he likes some kind of juice) and giving it to him; then once he accepts that, go the next step and dunk it in his water cup before you give it to him. I only give a tablespoon or two to my birds each day; that way, they eat most of it within a couple of days and you don't have to worry about spoilage. You wouldn't want to keep moist ("Dunked") food in the cup, of course, if your bird drops it back in his cup. But none of my birds has ever done this. They do show preferences for colors: my green-cheeked conures don't like the purple or orange pellets, and my caique doesn't like the green ones. Go figure!

Thanks for contacting us through the Petco portal. We just were advised of this program. I see your question is from some time ago. The 17.5 lb bags are not available at Petco retail stores. Often they have these on their website. You might check there. Thanks.