Petface Mega tennis balls for dogs available in yellow colour. Please note that this tennis ball is designed as dog toy and as such they don't bounce as much as real tennis balls. Dog toys are not indestructible and for your pet's safety you should examine the toy from time to time for wear and tear and replace when appropriate. Box Contains 20 x Tennis Ball Dog Toys. Box Contains 20 x Tennis Ball Dog Toy Safety Warning It is the responsibility of the pet owner to decide if this toy is suitable for their pet. Pets should be supervised when playing with toys. This toy is strong but not indestructible and will eventually become susceptible to 'chew' damage. Examine regularly for wear and replace if any damage could represent a health hazard.