Hi,
I do think they tend to come in all sizes to be honest. The mother of our viz was the smallest I had ever seen, probably at the lower end of the size scale, but her father was at the top of the scale so hopefully something in between for us. I wouldn't worry unless he is tiny and not growing at all.
For scale the plant pot is 16" or 40cm to the rim and Peanut is 12 weeks in the pic.
The only other bitch I have seen other than P's mum was a puppy near me and she was a lot bigger than P's mum at 8 months, so they can vary a great deal.
Hope all goes well at the vets
Graham
I do think they tend to come in all sizes to be honest. The mother of our viz was the smallest I had ever seen, probably at the lower end of the size scale, but her father was at the top of the scale so hopefully something in between for us. I wouldn't worry unless he is tiny and not growing at all.

For scale the plant pot is 16" or 40cm to the rim and Peanut is 12 weeks in the pic.
The only other bitch I have seen other than P's mum was a puppy near me and she was a lot bigger than P's mum at 8 months, so they can vary a great deal.
Hope all goes well at the vets
Graham