Pets and Vegan/Vegetarian Diets

So recently my dog (13 year old Border Collie named Shep) has been having trouble with his back legs and walking long distances. We also noticed a substantial weight gain.
Now, we only feed Shep once a day (with occasional treats), we normally feed him 1 can of Winalot dog food mixed with two small cupfuls of dry mixer.

So we have decided to start him on a vegetarian diet, perhaps even pescatarian, as he loves tuna! We don't feed him dairy products (minus a slice of cheese very very occasionally), so his diet would be more or less plant based.

I want to keep you guys informed of how it goes, and will supply recipes I've used for anyone who is trying to convert their dogs - I will attach recipes to the bottom of this blog however so people aren't making strange meals for themselves!

PLEASE NOTE:
Dogs (and cats!) need certain extra supplements to live on vegetarian diets. Dogs and cats are omnivorous (like us!) but, just like normal dog food, supplements are added to these foods that we as humans do not need, but that pets need for certain health aspects.
These supplements are Taurine and L-Caratine, which can be found in whole foods markets such as Holland and Barrett, maybe try somewhere else for lower prices, Amazon?
I'm not sure on exact amounts at the moment.

Some Useful Links
http://www.peta.org/living/companion-animals/vegetarian-cats-and-dogs.aspx
^ This will tell you the gruesome truth about what goes into your dogs tinned food!

http://thekindlife.com/blog/post/what-to-feed-my-dogs-2



*MORE COMING SOON*