I've been thinking about breeding Dwarf rats. My black male Berk-Blaze het. Dumbo seems ridiculously small for his age (mum and dad were smaller sized rats). His litter mates aren't much better. Though, they are all very healthy and very active,they just seem small.
They were born on the 27th of September. They roughly measure 4 1/2" from nose to base of the tail. And 9" from nose to tip of the tail.
Mom is 6 1/2 from nose to base. and 12 1/2 from nose to tip. Her sisters are about half an inch longer. I don't have measurements of the dad, but he was about the same size as the mom.
Does anyone have any experience breeding dwarfs? I heard they tend to have healthy issues, but never got the specifics.