tennis ball.

thekellyscope, Flickr Q: We took our puppy to a training class at the local pet store. The trainer handed out a list of dangerous items that we should never give our pets, and on that list was a tennis ball. We thought this was odd. We've had dogs for years and have always thrown tennis balls for them. As a veterinarian, do you see a problem? A: Yes--and no. Our Golden Retriever, Shakira, is a tennis ball addict, and a daily dose of fetch has helped keep her lean and fit well into her senior years. But tennis balls do present a hazard that requires they be used only in supervised conditions. SEE ALSO: Why Does My Dog... Lick and Chew His Feet? The problem is that dogs have strong jaws ...

PetteriO, Flickr When we asked him if he thought he could swallow the whole thing, he said yes, he saw a snake do it once. Fair enough. More Funny Animal Pictures ...

lawrencechua, Flickr The most amazing dog toys in the world aren't all that helpful if your dog has just torn through his most recent batch. Filling your dog's playtime with awesome toys and stimulating games can be as easy as grabbing things you already have around the house like socks, tennis balls, garden hoses and even paper cups and muffin tins. While you might not be able to keep your pooch entertained with just a pack of cards as photographer Lawrence Chua did with his dog Belle in the photo here, there are fun things you can create yourself with time and patience. And as plus, these toys and games don't have to cost you an arm and a leg. Muffin Tin Teaser This game (we'll call ...