What is the function of obsession?

he reminds me of my dog Turkish. my dog has this obsession with his ball or his toy. well he's got the same pattern it's like all either one of them can see is the one thing they are obsessed over if it is in front of them. the object of their desire. Turkish's eyes never leave from the ball it is literally all he sees and he doesn't hear anything your saying to him. He texts in an obsessive manner especially in regards to anything relation to sex or his freaky taste in turns on. he doesn't stop until he gets what he wants and then he disappears gone it's his rush his high god only knows. then you have the needy puppy that's up your ass needing attention, reassurance love petting afraid of being abandoned..but he leaves first. when i think of him it feels like a warm soft blanket is wrapped around me. It feels like home. is it because of my dad? am i suppose to wait for him? like I wa suppose to wait for mk. more will be revealed but i feel burnt after one day of emmail and text bombardment. he managed to extinguish my stamina. hes fucked me over on my birthday, valentines day, new years no phone call no text no email. hmmm