For science based information regarding health, vaccinations and such go here: http://skeptvet.com/Blog/
Find a vet that you like and trust, go for routine checkups. Start brushing the dog’s teeth, small breeds have lousy teeth. See youtube for how to videos.
Stay away from those treats you mentioned and boutique type foods.
Try giving him 1/3 of a raw carrot to chew once a day (not the baby carrots they are bleached plus they are a choking hazard).
And be careful gathering information on the internet, lots of misinformation to be found.
Fromm is a good food and they have treats, stay away from grain free, I like the classic or small breed gold for a kibble. https://www.gofromm.com/fromm-family-small-breed-adult-gold-food-for-dogs
At 5 months the pup is probably still teething, they chew everything in site till they are about 2 years old.
PUPPY PROOF YOUR HOME!
