49ers in Five: Jauan Jennings practices, Jacob Cowing hurt

Jauan Jennings practices, Jacob Cowing hurt San Francisco 49ers WR Jauan Jennings is not holding in as he waits for a new contract, and Jacob Cowing may miss time with an injury. Plus, Nick Bosa sheds light on last year's problems. One Thing to Read: The 49ers have depended on rookies before CHECK OUT UNDERDOG FANTASY: Sign up and deposit for Underdog HERE with promo code GOLDSTANDARD to get up to $1,000 in bonus cas