BlooChoo Antler Medium Full Xlong 50-75g. The products come from the collection and natural processing of deer antlers, which shed their antlers once a year. For this reason, they do not have a fixed shape and weight. BlooChoo Antlers come from the antlers of male and female deer. Each spring, wild deer naturally lose their antlers, which then grow back in their lifetime. This process continues, allowing pets to enjoy this treat. BlooChoo deer antlers are considered safe for dogs because they do not easily splinter and are a natural daily chew.