Do puppies start to teeth around four months? The reason I am asking is because Anthony has started to chew on EVERYTHING. Today at work, no matter how many corrections I gave him, he wouldn't stop chewing on his leather leash. I gave him bones and toys but all he wanted was his leash. Next time I am going to have to use the metal tie down if he continues to need to chew. Tonight since we have been home he is still in a serious "chewing" mood. Here is hoping he outgrows this stage!