Deer are skittish. Yet, they can kill your hunter if he doesn't have armor and tries to melee two of them. A wardog can kill a deer one-on-one, but will likely be killed by the herd. As ever, combat in DF is highly random - there are no hard-and-fast rules as to the outcome of a given matchup.
[CREATURE:DEER] [NAME:deer:deer:deer] [TILE:'d'][COLOR:6:0:0] [LARGE_ROAMING] [POPULATION_NUMBER:15:30] [CLUSTER_NUMBER:1:4] [BENIGN][MEANDERER] [PETVALUE:50] [GRASSTRAMPLE:0] [PREFSTRING:grace][NATURAL][PET] [BODY:QUADRUPED:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:MOUTH] [BODYGLOSS:HOOF] [MAXAGE:20:30] [ATTACK:MAIN:BYTYPE:STANCE:kick:kicks:1:2:BLUDGEON][ATTACKFLAG_WITH] [CHILD:1][CHILDNAME:deer fawn:deer fawns] [SIZE:5] [FAT:2] [DIURNAL] [BIOME:FOREST_TAIGA] [BIOME:ANY_TEMPERATE_FOREST] [STANDARD_FLESH] [HOMEOTHERM:10067] [LAYERING:100] [SWIMS_INNATE][SWIM_SPEED:2500] [MUNDANE]