Quote Originally Posted by martin82531 View Post
Would you still say rat pups or would a small rat be appropriate?


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at 420 grams 10% is 42g and 15% is 63g this is the rule for BP however I have found that the girth is still about right for boas as they get older 20-25% their weight the girth is better but with her on the small side i would stick to small rats until she starts gaining
Rats:
Age
 Weight
 Length*
 Equivalent
Rat Pinkies 1-6 days 3-8 grams 1-2" Mouse Fuzzie
Rat Fuzzies 7-13 days 9-20 grams 2-2.5" Hopper or Weaned Mice
Rat Pups 2-3 weeks 21-30 grams 2.5-3.5" Large Mouse
Weaned Rats 3-4 weeks 31-45 grams 3.5-4.5" X-Large Mouse
Small Rats 4-6 weeks 46-79 grams 4.5-6"
Medium Rats 6-8 weeks 80-149 grams 6-8"
Large Rats 8-10 weeks 150-265 grams 8-9" 1/2 lb Rabbit

This is the chart I use to gauge size of the rats and small rats would put her right in the ideal range unless you notice a large lump which I don't expect you will until her girth is larger and you start dealing with medium and large rats that where the weight gaps are larger