The butt in the air stretch is probably her just realising it feels better if you stretch first before you get up
Dogs do not have to be purebred to be OFA certified.
OFA Certification FAQ's
Avoid biting when a simple growl will do
The Spirit Lives As Long As Someone Who Lives Remembers You - Navaho Saying
Vindication ~ For all those pets who became sick or lost their lives from tainted pet food