How Often Should You Vaccinate Your Dog?

Hi , i just wanted to express my concerns of vaccinations of our dogs ,my late wife and i raised and showed oes in uk and canada for 35 years !!!, i have lost the last three dogs , to cancer !! , i am still broken hearted over the recent loss (2 months ago ) of alfie a canadian champion and beautiful dog , i just want to let everybody know my opinons regarding these losses , as i have travelled a lot , in the 7 years since the loss of my wife .Alfie was kenneled from time to time , but in the last three years he went to mexico with me , by car, and we were there four 4 months , to do this amount of travelling , the dog had to have his shots every year , and going to mexico requires the use of the product called revolution !! , i firmly believe this , along with TO MANY UNNEEDED VACCINATIONS, was the cause of his cancer !! ALFIE ONLY MADE 10 YEARS , not long enough!!.
Anyway just three weeks before leaving a lump the size of a tennis ball came up on his neck , it was needle biopsied and cancer cells and rbcs were found i declined surgery , at his age and decided to go for quality of life , anyway we made it back from mexico , the tumor had now grown to the size of a large baseball and Alfie was in pain , the vet tol me as soon as it breaks open i would have to call it , which i did on april 21 !! this was my last O.E.S. , SO PLEASE PEOPLE , do not go for all the advise on shots and flea prevention , sincerly devasted owner ,Dave. ps if anybody would like pics of the GROTESQUE tumor on my dog i would post them .