How much aspirin can I give a 16 year old yorkie that is crippled due to possible cancer in the back?

Any asprin you give him make it baby asprin it is buffered and wont upset his tummy ask your vet how many mg. or grains he can have a day remember a dog generaly does not complain about constant pain only sharp ones ===i know this is hard for you and the vet has left it up to you but the time is comming and you must prepare for it and you have done everything you possible can to make his last days comfortable ===but it is now time to decide what is best for him === i say this because i once waited to long to a point where i had to manually express the blatter and intestines which was very painful to the ainimal [he had spinal leasions which paralized him ] it still bothers me for waiting to long