For the teething, they usually start around 3 months of age so he might be starting to teeth now. Teething usually end around 7-8 months old.
They usually stop chewing everything when they are done teething(7-8 months of age). Rusty was never a chewer for furniture but I always made sure there is a chew toy(kong teething stick, kong toy that you can freeze with treats and peanut butter in). The cold from it being in freezer overnight with frozen treats and peanut butter in takes longer for them to get thru and the cold feels good on the gums/teeth and will keep him busy and quiet for a bit. Just make sure the peanut butter does NOT contain xylitol which is toxic to dogs, but easy to find it without xylitol.
Sounds like you are doing the rest correct. It can take a bit for them to get used to boundaries for other dogs, and not to chew stuff of yours. He is still a puppy and he needs to learn still.
Just continue the ‘NO BITE’, be ‘gentle’ with Petey, good boy positive reinforcement and short positive training sessions and end on a ‘good boy’!
Don’t let him over play himself, make him settle down(time to settle for 30 min in crate/give frozen kong chew toy to occupy him/afternoon nap).
No more than 45 min of racing around at a time, no racing around until 2 hrs after eating. Give him rubber squeaky toys, or something he loves. That way your not just saying NO or NO bite but your also saying NO bite but here chew this instead. Or ok you have played your 45 min, time to take a break and settle and give kong or put him in the crate to settle down then after 30 min of settled, let him out when he is calm. Get him excited for walks, harness is a good thing, not a bad thing so put it on him with excitement and a bit of time for him to wear In house off and on so he is used to it.
Also another tip:
rub all his paws, this makes him know holding his paws is NOT a bad thing. I did this with all my dogs and that helps when you need to trim the nails, they know you won’t hurt the paws and they will be less reacting if you need to checks his paws, clip nails, or wipe his paws down. Always good experiences with the paws when you rub them. Rusty literally just sleeps on his back while I trim his nails.
Things will get better and it will all be worth it
