There is no definate or correct answer for this request. It really depends on the individual animal.
As long as you can still feel the ribs and they have a reasonable waistline they are fine.
A puppy is still growing so I dont like to see skinny babies. Do you want to post a picture of the 14 week cav?
no i dont have a pic of her,
shes not my dog,
shes 14 weeks and 1.4kg, to me that just seemed way to small but i have no clue about cavaliers. when they first got her at 8 weeks she is what i would consider a resonable size in relation to body size and typr od dog, but she just seems to grown but not put on any weight, which is sad because shes a great puppy,
they have been having some troubles with feeding, she seems to be a very picky dog, and 'breeder' (dont know of what) have been talling them not to feed her anything but dry biscuits, which i think may be part of the problem, and i have a feeling she may only be getting fed once a day,