Bought a small satsuma three years ago. Only as big as shrub and hasn't grown much in three years even though fertilized - about 4 ft high now, looks like a rose bush. Had six fruit first year then year of drought with no fruit, this year about fifteen as big as softballs and a little dry.
Several branches scraping the ground and a few now 'shooting' from the top about 3 ft long.
What should I prune and do I cut right at the main trunk or can I just shorten the growth as you would a hedge?
Location : southeast Texas.

I never prune unless it is necessary to keep the tree out of an area that you need to stay open. If you have tall water sprouts you can shorter them to encourage branching. I allow limbs to grow touching the ground, they useually produce excellent fruit. If you prune the tree like a rose it will try to grow back and not produce fruit for a few years.

Citrus trees are seldom pruned. Pruning a citrus tree will stop fruit production, because citrus fruit develop only on new growth, and pruning by it very nature removes all the new growth. - Millet

limey, satsumas are slow growers, tend to weep and be "bushy". This is the normal state of affairs for most satsumas. Don't leave the fruit too long on the tree, with satsumas they don't hang well (can get dried out and sub-acid). If you water regularly, and fertilize enough and regularly, your tree will continue to grow and will also continue to produce. Satsumas tend to alternate bear, so I would assume last year was an "off year", and not so much due to lack of water.