Howell reference books (1981–2001)
- The Stone Guide to Dog Grooming for All Breeds (1981)
- Second-Hand Dog (1988)
- Agility Training (1992)
- The Athletic Development of the Dressage Horse (1992)
- The Winning Edge (1992)
- Breeding a Litter (1993)
- The Complete Book of Foaling (1993)
- Herding Dogs (1994)
- Successful Dog Breeding (1994)
- My Parrot, My Friend (1995)
- The Perfect Match (1996)
- The United States Pony Club Manual of Horsemanship (1996)
- The USPC Guide to Conformation, Movement and Soundness (1997)
- The USPC Guide to Longeing and Ground Training (1997)
- 101 Longeing and Long Lining Exercises (1998)
- Control of Canine Genetic Diseases (1998)
- The Complete Guide to Endurance Riding and Competition (1998)
- Advanced Schutzhund (1999)
- Help for Your Shy Dog (1999)
- The Stray Cat Handbook (1999)
- Holistic Guide for a Healthy Dog (2000)
- Kennels and Kenneling (2000)
- Poodle Clipping and Grooming (2000)
- You and Your Puppy (2000)
- Parrot Training (2001)