I've noticed that most of the minis are around 22 to 25 lbs. well, my Callie, a 2 1/2 yr old multi gen australian is 16 lbs! She is and always has been a light eater and I think she was the runt of the litter, she was 7 lbs when I got her at 4 months. When I asked the breeder how much she would weigh she told me about 20 lbs. does anyone else have such a little one? Or is this unusual?
I worry all the time too. Today Caliie ate very little. I think if they are not as active as they should be (don't know where you are but here in NY there's snow all over and she can't run around as usual), they kind of don't need to eat as much. She had some stomach issues and actually lost a pound but then I got her Honest Kitchen which she loved the first few weeks and now she doesn't seem as interested. I weighed her and she did gain back the pound. Well since I just ordered 10 lbs of the stuff that's what she's getting lol. As long as he's not losing weight and seems happy and healthy I wouldn't worry too much. But if you are concerned or if he's acting ill, I'd bring him to the vet.