Sasha is a little over 5 months and a solid 5 pounds. I just decided to switch her from Nutro Ultra to Wellness. I was able to get some free samples of Wellness Super 5 Mix Just for puppies and she seems to like it. But how long should she remain on puppy food? If I buy a 5 lb bag it's going to last months! Will I need to switch her over to adult food during that time? If so, should I just go ahead and buy adult food? I noticed Wellness now has an adult formula for small breeds so if I need to switch to adult food I think I'll try that out. By the way I'm speaking of dry food only. Thanks in advance!