Who says little dogs aren't tough? JR. TUFF MINT BALLS are INDUSTRIAL STRENGTH mini tennis balls made specially for little dogs. JR. TUFF MINT BALLS feature a BURST OF MINT to freshen your dogs breath and EXTRA THICK natural rubber walls which make them tougher and longer lasting. JR. TUFF MINT BALLS are NON-TOXIC and COLORFAST. JR. TUFF MINT BALLS use a special felt that is less abrasive. This helps prevent dogs from wearing down their teeth while playing fetch. Don't give your dog just any tennis balls, give em JR. TUFF MINT BALLS.