Answer: Monrovia currently lists a dwarf mugo pine, Pinus mugo pumilio, and describes it as growing slowly to 3 to 5 feet tall, spreading to 6 to 10 feet. The mature size will depend somewhat on the growing conditions. You can break off part of the new growth tips (candles) in the spring to try to keep it smaller and more compact for a longer period of time, however eventually it will reach those proportions. You would plant them about 6 to 8 feet apart if you want them to mature into a grouping, a bit further if you prefer to see them as distinct separate shrubs. If you need to compare this shrub, try to find the full botanical name as that will be more precise than the common name. Mugo pine (and also the name Swiss Mountain Pine) is used fairly widely as a common name for Pinus mugo. There are a number of different named cultivars and forms of Pinus mugo, most are fairly small in terms of height, var. pumilio is special in that it is one of the wider growing forms. I hope this helps.
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