Thanks Heathermaran,
The vet seems to think he is doing fine now. He wasn't a runt, the whole litter was very unhealthy and were very low in weight. I do have him on a large breed puppy food that is a controlled growth formula, so that may be sl...

Thanks so much for everyone's help. I can't find anything on the subject anywhere. Thanks again

He is currently 45 lbs at 3 1/2 months.

Hey everyone,
I have a 3 1/2 month old male english mastiff puppy. He was extremely small when I got him due to health issues. So I was wondering if anyone in here ...