SIZE: One Size
To fit an average adult cat
Ear opening: 2½ in. (6 cm)
Width of hat between ears: 2½ in. (6 cm)
GAUGE:
Exact gauge is not essential to this project.
Base
Using yarn A and size 7 (4.5 mm) needles, cast on 3 sts, leaving a 25 in. (64 cm) tail.
Row 1: Knit.
Row 2: Kfb, k to last st, kfb. (5 sts)
Rep last 2 rows five more times. (15 sts)
First Ear Hole
Row 13: K3 bind off next 10 sts, k last st.
Row 14: K2, cast on 10 sts, k3. (The 3 st side is the front of the hat.)
Middle Section
Knit 16 rows.
Second Ear Hole
Row 31: K3, bind off next 10 sts, k last st.
Row 32: K2, cast on 10 sts, k3.
Row 33: Knit.
Row 34: K2tog, k to last 2 sts, k2tog. (13 sts)
Rep last 2 rows five more times. (3 sts)
Bind off, leaving a 25 in (64 cm) tail.
To create ties, use crochet hook and 25 in. (64 cm) tail, pull a loop through each stitch on bind off edge (3 loops), yo, pull one loop through, work 25ch, pull end through loop tightly, and snip extra yarn. Repeat with other 25 in. (64 cm) tail.
Spikes (Make 3)
Using yarn B and size 5 (3.75 mm) needles, cast on 8 sts.
Rows 1-3: Knit.
Row 4: K2tog, k4, k2tog. (6 sts)
Row 5-7: Knit.
Row 8: K2tog, k2, k2tog. (4 sts)
Row 9: Knit.
Row 10: [K2tog] twice. (2 sts)
Row 11: K2tog.
Fasten off, leaving a 6 in. (15 cm) tail.
Assembly
Turn the spikes so that the cast on and bind off tails are at the bottom. You will have three dinosaur shaped spikes. The lower edge with both tails is the edge you sew to the hat base.
Starting at the center front of the base, stitch the lower edge of the first spike into place. Weave in both ends to underside of hat and secure. Repeat with other spikes, following center of hat and stitching into lower edge.
source - Cats In Hats - Dinosaur