Dog Health Questions: I need dog training help?

So my dog is 5 years old and is a German Shepard mix. Most of his life he has only occasionally gone on walks and I regret never taking him on walks but before you accuse me of being a bad owner it was because I was young and couldn't handle the dog when we first got him (sorry I had to say that). I am so sad that I never got in enough walks but within the last 4-5 months me and my friend have been walking him and I know he's in the habit of tugging on leashes (not as bad as he used to) and getting a bit reactive around other dogs (never biting or attacking). I'm patient and I know it'll take some time for him to be behaved but if you have any tips for training I would be grateful!

5 Basic Dog Training Mistakes

Recommended Answer:
one of the reasons that be pulls you is that he has not been walked.
but i know you know that.
what i would do is teach them not to pull ever.
you do that by having him sit next to you.
treat him if the leash is loose.
if he starts to walk away or tug on the leash, tell him "No" or some
other word to make him know you don't approve.
he might want to go sniff something.
don't let him.
if he is doing good with the loose leash sitting, walk slowly.
if he tugs, tell him know and stop walking.
Dogs stop doing what does not pay well.
be very patient. it takes a lot of time to undo a behavior that
he has learned is rewarding. He thinks he only gets to places that
are fun if he drags you there. you gotta teach him that he gets places
by following you and he even gets treated for doing it.
plus there is no tension on his neck.
if he is a high energy dog, i would teach him to go biking with you.
dogs are totally different when they are tired.
and active dogs love to run.
if you have the space, run him first before you train him.
if he is less hyper, he will listen better and the walk is not as frustrating.

Is My Jack Russell Suitable For Schutzhund Dog Training?

• Teach your Dog to Heel and when you stop he sits (you can say sit) and teach him to stay in a sit when a Dog walks up. then say "release" or "Yes!" to let him know it's OK to say hi.
  if He gets that down you have only 9 other tests towards his Canine Good Citizen.


• this worked for me~
  
  When your dog tugs on the leash, you stop for 5 seconds then continue walking ( repeat this over until your dog stops tugging)
  
  instead of the 5 second thing you can also turn the other direction for maybe about 5 seconds then turn back