Yep, it's a dog/cat high-calorie food that comes in a small can. Mix it with water to make it slightly soupy but still thick and then syringe feed it. It mixes very easily with water. Make sure to store it in the fridge with the lid on it(if they gave you a lid).

I would think after 2-3 feedings, you will notice a marked difference in energy and weight gain. This food is something his body can actually use and gain weight off of, as it has alot of high quality animal protein(no by-products). Hopefully it will get him off the ground and more willing to eat on his own.