ive had one where my dog chewed off my foot when i was five
also at the time our house was haunted, we don't live there anymore tho
i have a lot of nightmares about animals, mostly cats or dogs or maybe the occasional deer, where they are just normal and cute but as soon as i think about something remotely negative they turn into rabid hell-beasts so i avoid animals in my dreams whenever i can.
my most recent nightmare was about my pet rabbit dying again, which resulted in me waking up and crying for two hours.