Like I said it just a personal opinion & nothing I can prove so take it for what it is worth. I probably should not have even mentioned it. I don't want anyone thinking that I'm promising enclosures of a certain size, lack of size, etc do anything out of the normal. I kind of just developed the personal believe raising my multiple little ones that habitat may play a role because of the drastic amount of growth & sheds I experienced after switching them to a larger enclosure. It's very possible it could it be a more suitable climate change in the larger enclosures promoting the growth or just coincidence a growth spurt happened around that time... but I don't believe it's as far fetched as it sounds when you actually think about it. Now I'm not saying I think a boa can out grow it's species proven length by much, I'm only saying I think the max size is reached at a much faster rate. I'm sure we get a few other opinions but if it is true I would be curious if it affected the boas long term health if at all.
I've heard of a enclosure being to large & causing stress on an animal but question that also at times. If the enclosure has plenty of hides for the animal to secure themselves if the need was felt & it easy to find necessities such as water & hot spots, I don't imagine it being a issue. Honestly I see a possibility of it be a bonus proving ample room to move, stretch, & exercise when not taken out. I get boa's are not chasing down prey but being a heavy-bodied bred & being feed like clock work every 2 or 3 weeks make me believe it easy to become lazy especially without the room to explorer. Most younger snakes seem to like to explore more when being held compared to larger snakes & I'm not sure if its due only to age & size.
Honestly, I'll have to go through a few books & do some searching & hear from more experienced keepers then myself. If I come up with anything I'll let you know but until then the idea of habitat size playing a role in growth rate during a certain period is just a opinion/thought of mine with no hard evidence to back it up.
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As far as this snake's length, I believe the plastic dog bowl in the picture is manufactured by a company called Paws-N-Claws, & they measure about 9-1/2" diameter (don't ask how I know that). From the looks of the photo, if she isn't 11" she has to be pretty close to it.
