Level up your language and talk to the dogs, they will start giving you quests and you have to complete them one after another in order to complete the game. There's no other way around this. So talk to the dogs until you understand them, they will give you quests.

The first quest will be to get the rubber duck from the bathtub. You will learn from the dogs (and hints) that the key to the bathroom is in the sink. After getting there, you will have to talk to the jumping dog in order to learn to swim. After doing this, keep leveling up your language skill and collect bugs. You will end up giving a mouse to the dog in the cage.

After a while, the jumping dog will start allowing you to level up your speed - take a few upgrades, but don't spend all your bugs on that yet because you will need them for other quests. For example, the next quest: the medicine. You will need 500 bugs to give to the dog in the cage in order to complete this quest as you need his treasure: a DVD. Play it in the DVD Player, then go to the dog house - blindly move forward as much as possible, then all the way to the right. You will get the study key.

Go to the computer and use it - you need the password: 4, 7, 6, 3.
Go talk to the dog in the jail house, then collect the oil canister. Go to the flower pot and dig - then return the dead puppy to the jail dog. Go to the warehouse.

Once there, you can eat all the dog food to earn a ton of fast levels! Also get the medicine and deliver it to the dog. Then give her the oil can - you need to fill it with oil first, though, from the toilet.

Now talk to the dog guarding the door - you have to collect 1,000 bugs!

Everything goes on and on like this for the remainder of the game: you need to eat and collect bugs, level up your speed and complete missions as soon as you're ready to understand what the dogs are saying.