My dog I a staff, she is a year and a half so still a pup. She has been acting weird, she sleeps in bed with my sister at night and has recently been sleeping by herself, she hasn't been herself, and when I was stroking she started to yelp really loudly, then when I gave her her food, we done the normal routine of paw then speak, but when she barked it sounded more like a cry, and like she was in pain! She has a white patch on the top of her head and the hair had fallen out! Do you know what's wrong?

Does she have fleas that might explain the hair falling out.is she under stress? Has anytrhing dramamtic happened? Do u have any other animals that might of hurt her? Iw ould suggest taking her to the vet they can properlly examine her and see what's wrong plus it could be something really serious.

It sounds as if she is in pain or uncomfortable. Did she eat the food when you gave it to her? And where were you stroking her when she yelped? Have you noticed any vomiting or diarrhea? Is she limping or walking a little hunched in her back? Is it possible for her to have gotten into the trash can or has someone given her a big helping of table scraps? Take notice of all the things that aren't quite right.
The vet will want to know the answers to these and many more questions. You've probably guessed by now that my suggestion is to have her checked by your vet.
Better safe than sorry if she doesn't seem "right" to you.
Do not give her any medications meant for humans without first consulting with your vet, they can be very dangerous to dogs.
Good Luck, I hope she is better soon.

She could have many problems: hair loss; fleas, disorder; when you were petting her you could have hurt her intestines she may have a problem there take her to the vet and get the spot looked at and have some x rays taken oh about the bark check with the vet about her vocal chords