Having A Squirrel as a pet

short answer no it is not prohibited but remember prophet Muhammed(pbuh)'s hadeeth (quote): {A woman was punished because she imprisoned a cat until it died. On account of this, she was doomed to Hell. While she imprisoned it, she did not give the cat food or drink, nor did she free it to eat from the earth.} also: He also said that a man gave a very thirsty dog a drink, so God forgave his sins for this action. The Prophet was asked, “Messenger of God, are we rewarded for kindness towards animals?” He said: {There is a reward for kindness to every living animal or human.} so if these animals can't live away from their families, you shouldn't buy them in order not to encourage the sellers to bring more of them :( from that I prefer leaving these animals where they belong but if you insist I think it is better to buy it from far away rather than taking it from its family.