Dog: Your dog will most likely be on your farm when you start like in any other HM game. He/She will probably start out as a puppy and grow as the seasons pass. You will aslo be able to play with him using a ball or a frisbee.

Horse: Your horse will come from Barley's Farm free of charge (Or at least I think.) I have no idea if you will be able to ride him/her right away, you might have to wait until he/she grows up to ride him/her.

Chicken: You can buy chickens for a reasonable price of around 500g and you can sell the eggs that they lay and hatch them yourself. I don't have any idea how much you can sell the eggs for.

Cow: Again you will be able to buy cows for around 5000g and milk them after you have bought the milker, you will be able to use the milk in recipies or to sell ofr profit.

Sheep: I dont know how much sheep will sell for but I am sure that you will be able to sheer the wool and sell if for profit also.

Once again I am not sure how much you will be able to sell the products you get from the livestock. I will post all of the prices and details after I buy and play the game.