[cypher]

66g isn’t what I’d consiider obese for a Russian hybrid more like average although they do vary a lot in weight & some can be a fair bit less or even more.
I wouldn’t cut his food back too much as it’s important he gets all the nutrients he needs, it’s always better to encourage more activity, so plenty of enrichment in the cage to keep him busy, scatter feeding & time out of the cage with lots of things to explore.
What are you planning on feeding him? I know it’s hard to get a goof mix for a dwarf in the US.