Mom is always pampering her little dog by brushing its fur and preparing special treats every day.

pampering 是动词 pamper 的现在分词形式。pamper 的意思是"娇惯、纵容、过分宠爱"，通常指给予过多的关爱和照顾，满足各种需求。pampering 在这里表示"宠溺"的行为。