The first pet portrait I ever did was of our English Bull Terrier Lola. It was a gift for my husband for Christmas a few years ago and I did it from a tiny image on my then phone - a blackberry - no mean feat let me tell you!!
I always encourage people who tell me they'd like to start drawing or painting to just jump in and do it! Clearly this is not my best pet portrait but it is still one of my favorites because it is of our pet and it was my first. Start with a subject you're familiar with, don't get too caught up in the outcome and just enjoy the process, you never know, it could be the beginning of a whole new venture. Do yourself a favor though and don't use an image on your phone as reference!
Let me know how you make out and stay tuned.......