Petco Text Logo
Petco Pet Logo

My Jack Russell is nipping strangers. Why is he acting aggressive?

Updated On September 23rd, 2025

Pet's info: Dog | Jack Russell Terrier | Male | neutered | 5 years and 4 months old | 22 lbs

My Jack Russell 5 yrs old has become mean to people (ex} I fell and a person came to help me up and my dog nipped at his leg did not break the skin but this has me afraid of why he is so quick to act .My dog is very loving and calm w/me has the breed a possible problem that I will have to attend to quickly I am 79 yrs old and he is my buddy but what is making him so mean Thank You

1 Answer

Most Helpful Answer

Image profile

Answered By Dr. Davis

Veterinarian

Published on September 19th, 2017

Jack Russell terriers are know for being loyal and also very protective of their owners. In general terriers are more quick to bite than many other breeds. With my terriers I keep them at home and have them in a crate or separate room when people come to the house. Mine are loving and fine with me and my family but not with strangers. Additional training may help but not always. I recommend eliminating any chance of Macho Man getting near anyone new so he doesn't bite as that could result in a serious injury. Also it may force you to get rid of him which would be sad as the two of you are great together. This is definitely more difficult to manage but the best solution is to keep his away from others so this biting behavior is eliminated. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Macho Man.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored