Most of my portraits are of single subjects, though I have been asked to include up to four.
I will give you a choice of two kinds of canvas in different sizes. Regular ones that are designed to be framed. Or so-called Gallery Wraps that are deeper, have canvas wrapped round the sides and can be hung without a frame.
A photograph catches your pet in the moment. A good painting conveys the essential character of the animal more faithfully. That's why my clients find it more satisfying to remember their pet from a painted portrait than from photographs.