He's a male, they will stay smaller. Does he have good muscle tone and have a good appetite? If so, he may just not be a huge snake. 6ft and 15lbs seems acceptible for an adult male, though without pictures it's impossible to tell. Boas shouldn't be allowed to become obese and they do have different body types. Some grow larger and longer than others, some stay smaller. You don't need to force the issue, and if the snake looks healthy, is probably just naturally on the petite side.

Some snakes have more liquid urine than others. One or two of my boas will have liquid urine when they release urates, others just have solid urates that are released when they defecate.

However, you are taking a lot of risks introducing medication when it might not be necessary. It's always good to find an exotic vet, especially if you have a large or expensive collection.
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Lauren Madar - OphidiaGems.com | CageMakers
1.0 Ball Python, 1.0 Hog Island Boa (RIP DeeDee), 1.1 Hypo BCI, 1.1 Surinam BCC, 0.1 Green Tree Python

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