There are many organised activities and competitions you can participate in with your K9 companions.

Agility
Our two dogs both totally enjoy agility.  Its basically running an obstacle course designed for dogs.  Jumps, Tunnels, Ramps, A-Frames, SeeSaws and Weave Poles.  When starting out its best to find a club or class being run near to you where you can go and get some basic coaching on how to start out and get some assistance in teaching your dog the ropes.

The Kennel Club of Great Britain back a number of national Agility competitions.

Flyball
This is a individual or team dog sport, where dogs race against one another over a number of hurdles and release and then catch a ball from a spring loaded pad followed by returning back over the hurdles.  Although it may seem it, this sport is not purely the domain of collies and can be enjoyed by most dogs.

Many relay teams and clubs are available around the UK.

Obedience
Basic through to advanced obedience training is not only a good exercise to keep your dogs mind active, it is very beneficial in producing a very well controlled dog.

Obedience can be taken to a competitive level where everything has to be done perfectly and is judged and scored on how well commands are followed.

Tracking
Scent based activities such as Tracking Trials have developed to make dogs use possibly their strongest ability. Several variations of these activities are competitive but all make your dog use its nose to track or find a person or object.

This does not need to be competitive and can make a fun game of hide and seek to play in long grass.