I’m not sure on how big he will be. For Peanut I think he stopped growing at a year- He is 4 pounds at age 6.. well will be 6 on the 25th. Peanut is still not big enough to jump off the couch or bed LOL. I have stairs for the bed ( CVS for $10) and I have a step stool for the couch. I’m going to buy the same set of stairs for the couch. I think the stairs are great to have if you have small dogs, even a 10 pound dog an jump off the bed wrong and break something.. it is better safe than sorry! Plus the stairs are so much better for their joints!