Dog agility photography is not the easiest of skills to master. The speed of the dogs, together with the pace at which dogs change in the ring, means the photographer needs to be on the ball all the time, and ready for any eventuality. When the dogs start, get your focus on the first jump or obstacle. Do this by focusing on the top bar of the jump, or the equipment where you want to capture the dog. With a DSLR this is easy to achieve, by half pressing the shutter button. Then when the dog is in position to jump, fully press the shutter. Remember, due to the speed of the dogs, you need to release the shutter just before the action you want to capture. Then move onto your next jump and next. With practice, this becomes easier.