Your dog looks like a pure bred American Pit Bull Terrier or APBT mix.
What is her weight/height. In the photos she looks the size of a pure bred female APBT, but it is hard to tell with pics.
Lots of breeds chew toys, not just terriers. Labs, Rotts, GSDs and sure those little terrier breeds too. Many dogs can also be "dominating". Either of those can be seen in APBTs (which are bull and terrier and traits that belong to both bull breeds and terrier breeds).
Yeah some of mine are very vocal, mostly the ones who are related are all the vocal ones. APBTs will sometimes whine, screech or scream. Other times they grumble, like this little growly complaining sound. Bot different then growling aggressively. Other times they will bark. Other times they put their lips together and make a little brrrrr grrrr sound. It is cute.
Dogs sometimes pant or shake when nervous. Its a sign that they are stressed out.
In the pics it does look normal Pit Bull length, they have a short, slick, smooth coat.
"Shivering" I know many Iggys do. Although other breeds can do it too. It is really hard to say.
I don't think she looks like a Staffy, but it isn't impossible she is a Staffy mix. You just never know. APBTs are much more common so it is why I lean that way.
She looks heavy enough and couldn't imagine putting more weight on her. Diet and exercise are good though so you might want to consider that. Although typically might (I believe most others too) drop a few lbs with diet and exercise, lean out, loose fat and gain muscle. I'm not going to judge you by your dogs nails either, I've one biked with everyday on pavement and his nails still grew really long. I cut his about every other week to try and keep them trim. I was so hoping the biking would help keep them filed them down!!!! What exercise do you do, what does she like? How long have you had her? Any more pics?
I have APBTs, here are the girls. Which are 25-35lbs. The last 2 in the 2nd post are both boys however. They are a little bit bigger 39-41lbs and 45-47lbs.
