It may have some Flemish in it, but if it's only six pounds at six months of age, it's not MUCH Flemish. Typically a 6-month-old Flemish will be well over ten pounds, and at 8 months they have to be at least 13. We have a guy who's five months old and weighs a touch under 13. We have seven-week-old kits who weigh almost four pounds.
So, it appears to have a Flemish-type head and ears but something else for the father,.