Plus one on this, we use viovet for ours
6 year old vizla has 2 packs a day
3 year old fox Red has 2 packs a day
2 15 month old Weimaraners have 6 to 8 packs a day.
Going by your amounts our dogs would need the 6 to 8 packs a DAY, EACH! How much does that cost you a month if you don't mind me asking?