bull breeds arnt really for guarding just agression really,ive got a doberman he does the job very well so id say doberman,rotty,alsation,american bulldog if brout up right they great around kids but mke sure u sociolize them with kids from young the boy i own is great around kids and is loyal and he can go 4 it just mke sure u are firm with them so they are nice when needed and then go [bANNED TEXT] told to guard stay away from french mastiff they are all bark very really bite