I would recomend ASAP. But then again I started training my service dog at one year, but I know a lady who had a pretty darn near perfect service dog in training a 8 months. I guess it depends in the dog.. Start on all the basics and once you get him good with those around people start training some service tasks. I know a lot about service dogs if you want to PM me
Elios. 2 year old light liver GSD
Harvey. 14 week old Hedgehog
Ripley & Daxter. Albino ball pythons
"Money will buy you a pretty good dog, but it won't buy the wag of his tail.."