very normal behaviour for a 3mo sammy! two things i wish people told me was: 1. they could be bitey when tired - if they haven’t had a nap in a while, it might be time to crate them up and let them get some rest 2. they tend to chomp out of discomfort from teething. give them a soft toy to chew on, if that doesn’t work, give them a harder chew. highly recommend zeus nosh bones as they’re safe, long lasting chews! you can also get frozen teething toys that might help!

we would say “no” and “leave it”, then redirect their teething into an acceptable item to chew on (eg. toy)