Problem with aggression and biting

[sable]

I was told this by some very reputable dog people that inbreeding will cause an aggressive dog. I would call the breeder
also and ask many questions. She may have more like your sheltie.
Hopefully all turns out well for you.

 

[SKNerissa]

I also agree that a veterinary behaviorist is the way to go with such serious issues. Also, be sure that a full thyroid panel (preferably done by HemoPet) is included in the blood work as agression is a very common symptom of hypothyroidism.

 

[SKNerissa]

Here is a very good article on the association between hypothyroidism (which shelties are considered high risk for) and behavioral issues including aggression. It also explains that in-house T4 testing gives false results in over 52% of cases so sending out to a reputable lab is very important. https://www.whole-dog-journal.com/issues/8_6/features/Dogs-With-Hypothyroidism_15723-1.html