Yes exactly. The 4lb (or less) is generally weaker in every sense. You need to be super super careful. I really cannot imagine those with Yorkies less than 3lb! They also usually have a higher mortality rate - they don't usually live a long healthy life (I say "usually", because, as with everything else, it's not "always").
The only reason I was okay with getting Casie (the 4lb-er) was because she's from the same breeder as Scottie, who I know very well now, who I've kept in touch with since we met, who I visit every time they compete in shows, and who has an entire bloodline of champions! So, I have high confidence in their dogs' health and Casie was just the runt of the litter - as she wasn't intended to be bred small.
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