I can't identify this citrus tree
I bought a house in May and it has a unknown citrus tree in the backyard. I cannot ask the previous owners what tree it is because it was a foreclosure. I do know they planted it themselves and it was 2 feet tall in pictures from their attempts to sell the house 3.5 years ago.
I have tried looking stuff up on the net and to figure out what it is by smell, shape, etc. I am unsure what it is.
It has the shape of a lime tree (I think), it smells like a lime or possible lemon by going by the leaf, the bark does smell like a lime or lemon. It's strong in smell, but so are lemon trees that I tested too. It is about 6 feet tall at the highest and has an odd shape. It has thorns that are about 1 inch long. The leaves are yellowish green and have jagged edges, but aren't sharp. The biggest leaves are 3.5 inches long. I would estimate this tree to be about 5-6 years old.
It hasn't had any flowers or fruit at all.
PICTURES (sorry don't know how to add pictures or proper links):
Some more questions:
How can I tell if it is a dwarf tree or not? If it is 5-6 years old would it be taller than 5-6 feet if it were not a dwarf? It has not flowered at all since March of this year, why when it is around 5-6 years old? It is kind of yellowish green in color, not dark green like my new citrus trees. I have been watering it more and recently gave it citrus fertilizer in hopes to make it more healthy. It has grown about 1 foot in height since I started watering it this summer. Any ideas on how to make it flower for next year?
Here is a link that might be useful: