Cattle can be turned out onto the Forest by people who have commoning rights. The fee for turning out a cow is the same as the fee for a pony.
The Cattle on the New Forest are generally docile and ignore people but they can become aggressive when they, or their offspring, might be threatened by dogs, so it is always best to keep away from them, as they are big animals and could easily cause serious injury. If you feel threatened and have a dog on a lead, let the dog off the lead, move away and let the dog fend for itself.