my male english mastiff is 150 lbs and 3 yrs 7 months old. 4 months ago he tore his acl sugery so i had the sugery done for 3200. i believe its tplo the newest one. after a long recovery process and a loss of 15 lbs he has torn his other. this whole process changed my dog completly. hes weak and it looks like his back hurts. finacially thats a lot of money for me since i just payed for the other. he has arthritus starting allready. what do i do has anyone been though this with both knees in a short period and if so how did it go? hes getting no exercise the last 3 months andd now he can barly walk...pleaase give me your experiance is there an end ?willl he return to normal?