I took the girls out to potty a few minutes ago and there was this pup huddled up against the tire of my truck. I thought she was hurt because she was growling and sort of dragging herself around. I put the dogs in the house and grabbed a handful of kibble and took it to her. She gobbled it up and came to me and rolled onto her back and let me pet her. I guess she decided that I wasn't going to hurt her so she stood up and jumped into my lap. Her back legs and tail are covered dried urine and weeds. I think that whoever she belonged to wasn't very good to her. She seems astonished that when I move, it's not to hit her. [

] She is seriously hyper! She literally sits there and jumps straight up in the air a good 3 feet over and over again.
Someone tell me what to do! She has a collar, but no tags. Do I place a found ad? I am not sure I'd want to send her back wherever she came from because I think she was abused. I don't want to take her to the shelter because the kill rate here is about 80%... what do I do? I'd call some rescues but I haven't a clue what kind of dog she is! Maybe you guys can help figure it out? She is just losing her baby teeth and starting to get her adult teeth and I'd guess she weighs about 12-14lbs.
Also, it is supposed to be 111 degrees today so I can't leave her outside, do you think I should give her a bath or would that scare her too much. She is covered in urine and I really don't want it in my house...
Any advice would be much appreciated!!