Caring for a Three Legged Dog or Cat

I am the girl who never thought she'd have to deal with nor make decisions regarding the life of my best friend, Bandit. For 8 1/2 years he has been a huge part of my life, or I should say our family's life. He has brought us laughter, loyalty, security and most of all overwhelming happiness and friendship. Much to my heartache my life at the moment feels like a bad dream.....my dog has cancer and I don't know what to do. I am scared to death to make the wrong decisions! All I do know forsure is that my heart has been broken by this. This is how I ended up here! My hope is that people who have been in my shoes and love their dog as much as I love mine could give me advice and help us. I am holding onto hope! I pray that he knows even if I make the wrong decision along this devasting journey that he knows....I tried to do it all right and that I want him to keep his dignity along the way!