[bANNED TEXT] forget that, don't think their quick enough for that. Have hunted wild boar with Dogo's, but a rabbit or rat is to quick in little spaces and make too fast turns.
What weight is your Bullmastiff? Reckon she will be even too heavy built to run for a long time without doing herself a lot of damage, let alone the injuries by very quick and often turns in a blink of an eye.
im unsure on her weight,
i dont think she'd do damage,
shes been trained doing long distance running since she was young.
she used to do a few miles a day running and shes on protein and eating tripe et