The time you should let your dog chew on an antler will vary depending on the size and type. Generally, small dogs can chew on antlers for up to 15 minutes daily, while larger dogs can have up to 30 minutes of chewing time. However, it's important to monitor your dog's chewing habits closely and remove the antler if they start to splinter or break off pieces. Splintered antlers can be a choking hazard and cause serious dental damage. Additionally, if your dog becomes overly aggressive when chewing, it may be best to limit their chewing time or switch to another chew toy.