Could a dichromatic animal distinguish red and green but not blue?

If a dichromatic mammal had better night vision than a human, including tapetum lucidum, could they see large (red) and medium (green) light wavelengths but not small (blue)? Would something similar to tritanopia be possible, and if so, how likely? Most mammals that I could find couldn't distinguish red, is that because rods can't pick it up as easily because its wavelengths are large? The animal I'm trying to design can't see uv wavelengths.

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Could a dichromatic animal distinguish red and green but not blue?

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