http://www.bravorawdiet.com/calculator.html

I used this as a basis, for Molly you only need to feed her 2 ounces per day, which is a little over .1 pound! For Sammi, you should feed him around 8 ounces or 1/2 pound daily. If he tends to gain weight, feed him around 5 ounces. This is very cheap to feed, especially if you base their dog on Chicken, Turkey, Rabbit, Duck, etc (which you will need to do, since both dogs are fairly small to be chewing any larger bones). IMO, for dogs their size, feeding fowl for RMB's and red meats as muscle meat is ideal. I would guess you'd be spending around $20 per month as a maximum, if you can find meats that are around or under $1/lb. It really depends on where you live & the local meat prices, but if you were feeding under 1 lb of meat daily, it would not cost more than $30 per month.