Each Province has different regulations regarding dangerous game bow
hunting.  Buffalo is not regulated in terms of the TOPS Regulations at all.
It is thus one, of the only two dangerous game species, that may be hunted with bow. The other is Hippo, which is also not listed under TOPS. ( some Provinces have a moratorium on bow hunting of pachyderms )

Bow hunting of dangerous game, such as buffalo will always be subject to a permit for the bow. ( it is considered an illegal weapon and exemption is not granted as is the case for other Antelope species ) In order for a client to hunt dangerous game with a bow, they need a "certificate of competence". The only accredited people in the USA to give this "certificate" is the "NBEF" ( National Bow Hunting Educational Foundation ) and I do believe the people involved there  is , Neil Summers and Dr. Samuels.

If the client does not have the ability to get such "certificate of competence", they should supply the Hunting Outfitter with proof of being competent with a bow, which will be used as motivation in the permit application.

The clients must make sure, that the PH who will guide them, has an "unlimited PH permit" in the Province this guiding will take place, and that the PH has a "certificate of competence" to guide a "bow hunting client" on a dangerous game bow hunt.

If all these are in order, most provinces will issue a permit for the client to hunt a Buffalo with their bow.

The current requirements are:

Minimum 80lb bow

Minimum arrow weight is 700gr

Arrow heads must be single forged with cutting edge starting at the point.

Maximum two cutting edges, which must be at least a 2,8cm (11/4") cutting edge.

NO mechanical broad heads are allowed.