Great training treats are Zuke's Mini Naturals.
Amazon.com: Zuke's Mini Naturals Dog Treats:... You can get them at Petco. They are about the size of an eraser and soft and chewy. They are low in calories! Great treats for trick training, and it won't fill them up too much.
Also, Wellness has some good treats that are square shaped and can be broken up pretty easily. Jackson loves them.
Amazon.com: Wellness WellBites Soft Dog Treats:...