Maxx Pro 50 Ring is for larger dogs weighing over 25kg.
It is the most durable shape for extreme chewers. 
The Pro 50 GoughnNuts are the strongest compound, and perfect for extreme chewers that have previously chewed through a MaXX Ring
The MaXX Pro 50 ring  has the red safety inner core.Should this become exposed, please return the toy to be replaced under the Lifetime Guarantee.