This is a fabulous design.
Ms. Loly writes her directions in a non traditional manner. One gets the hang of it without too much trouble.

Construction tips:
Stepwise pictures are not included but there are numerous pictures from every angle of the completed piece to go by.

Upon sewing the underside to the main body, one leaves the bottom of the legs open, stuffed. The feet, knitted separately, are attached to the bottom of the legs.

When stitching underside to the upper body piece, one must ease some stitches of the upper piece to the under one at the posterior area. The back leg stitches are joined even, but the curve of the posterior needs easing.

Erratum:
Interior parts of paws and belly:
Pattern states:
K- 32 st/Cast on 16 st = 48 st.
K/P/K/P/K/P/K/P/K/P/K/P/K/P/K/P- 16 rows.
Correction:
After the K row (48), work 15 rows st st, beginning and ending with a purl row.
In her manner:
P/K/P/K/P/K/P/K/P/K/P/K/P/K/P = 15 rows.

Suggestion:
Increases are written as working two stitches into one = kfb.
Instead, work (k1, M1) at the designated stitch for a smoother look.

Modification:
Made the tail twice as wide and 2 rows longer than pattern. The tail as written seemed too narrow and too small.