I have picked up a foster kitten this afternoon. i think he has fleas. I've seen a couple of black specks in his fur and have the itchy feeling that i get when my other cat gets fleas. I'm not sure how old the kitten is. It's not tiny and is weaned, ready to rehome. What should i use? I would use the spot on treatment but am worried he is too young. What should i do? I've tried messaging the animal rescue but no answer so far.