This is a brilliant, fast paced, spot the difference style card game perfect for travelling due to its small size.
The main aim of the game is to collect as many dogs as possible in the fastest time, however the dogs have to be exactly that same as the one in your hand or only have one difference, this means you could be looking for the same card as your opponents!
If you're more of a pig person than a dog person check out Pick a Pig, which shares the exact same gameplay just with Pigs. Or if you want something a bit different you could look at Pick a Seal or Pick a Polar Bear, which are the same mechanic but introduce some gameplay variations.
Don't just take our word for it! Check out this review of Pick a Dog.