Challenge Slider by Nina OttossonThe Challenge Slider dog puzzle from Nina Ottosson by Outward Hound is an advanced level 3 game designed for pups who have mastered levels 1 2. This dog toy will promote the mental wellbeing of your dog by keeping them active and engaged while sniffing, nudging, and pawing for hidden treats! A sliding tray pulls out from underneath with 24 compartments that can hold up to 1 cup of food total. Slide the tray back in and place on the floor in front of