Doge is a stable coin and this is probably one of Dogecoins best attributes, and one that makes it a good buy, not just in 2019, but for years to come. Thats because, part of what holds crypto back from mass adoption is volatile. It is impractical for most cryptos to be used as currencies, since they expose businesses to massive losses when prices fluctuate. In essence, stability will in the long-run determine which cryptos thrive, and which ones die off.