The Irish Wolfhound grows at an incredible rate.  The newborn pup weighs about 1 to 1-1/2 pounds. By the time it is ready to go to its new home at around 12-13 weeks of age, it can weigh around 40 to 50 pounds.

Newborn pups enjoying their first meal.

Puppies at one week. Colors range from wheaten brindles to red brindles.

2 week old puppy after a nice big meal.

Same puppy as above at 12 weeks of age.  See how he has lightened up. 

The growing puppy once he is in his new home:

 
At 4 1/2 months the puppy can still fit into your favorite chair.

At 6 months it takes a couch for the two of you to cuddle.

At 10 1/2 months he begins to look more like a real wolfhound.

Thanks to Sue Orr for this great pictorial.