OF COURSE YOU CAN!
oh man, i do it all the time and it gets irritating when people buy into this ridiculous myth. Dogs can be trained at any age whether young or old. And older dogs are just as smart as young puppies. in fact most older dogs have a greater attention span than a puppy, which makes them easier to train. of course socializing your puppy and training them at a young age is of great importance but that doesn't mean your grown up doggo can't catch up