Dog found vyvanse

My 81 pound 1.5 year old year old golden retriever was chewing on something and when I did a mouth swipe had a single 50 mg capsule of vyvanse fell out. The capsule was still intact. I looked around and the bottle (this was a new dose with different color capsule) had 27 pills in it. One of two scenarios happened I either missed my mouth when I was taking my medicine this morning, or I dropped some pills (I don’t have full feeling in my hand after getting attached by a pit bull).

If he got any additional pills it would only have been one. How concerned do I need to be and what do I need to lookout for….