Asking all those experienced Mamas for advice!

So, I feel like I'm driving everyone nuts with all my questions, so I thought I'd put them on there where people have the option of reading them instead of forcing them to read them on the board. :)

I'm discovering there is more that I don't know now than when I first had her. At least when she was born the books were more help. Now they get so wishy-washy that they are useless!

1. Jana loved a bunch of finger foods until this last weekend. Now she'll only eat Cheerios and bananas. Is that normal? Am I supposed to keep giving her other foods? Should I stick with the same foods or should I change it up and try a variety. We're only giving her things she's eaten in baby food form, but should I try one for a while and then try another?

2. She has suddenly started crying. What the heck? Today she was crawling around the kitchen following me as I was packing up her lunch (my inlaws watched her for a few hours that I worked), crying and yelling at me. She had these big old tears running down her face, but there was no way I could be her stuff ready and hold her. (She only took a 45 min nap instead of her usual 2 hour, so I was caught off guard). Why has she suddenly started crying?

3. Sippy cups. My nemesis at the moment. We've been trying since she was about 7 months old. She won't suck on then and then jumps when they pour into her mouth. She'll tolerate a few sips of juice/water, but then she's done. I can't even imagine trying to give her formula in one. Any suggestions?

4. To sleep or not to sleep: that is the method of torture for mommy. She's now refusing to nap at some point in the day almost daily. She's exhausted, I know this. But, if I put her down too early, she cries because she doesn't want to be there and if I wait too long, she has a total melt down and won't nap because she's crying too hard.

5. The dog. My dog has started being so obnoxious. She walks over Jana, knocks her over, licks her to death, and barks at everything. She is driving me crazy and seems to be getting more and more obnoxious as time goes on. We don't want to just put her outside, but at the same time, I'm starting to really not like her so much right now.