I have 3 clients with Westie's. One home with a male also has a female Yorkie. Another home has a single male and finally a home with a single female.
To be honest....not trying to offend Westie lovers but all three of them are possessive of toys and bones. Will bite if you come near them while eating a meal. Very stubborn. Have to be bribed to get them to pretty much do anything. All three show aggression towards other dogs while ON leash. The male and female Yorkie combo guy is very bossy towards her.
If these were all in the same household I could see where it might be blamed on their human counterparts but seeing how they are all in different homes it seems (TO ME) to be a bit of "traits of the breed". Could be wrong though!
All three are affectionate towards humans and love to play. They are very funny too and all love to DIG! Did I mention they also love to bark? :D
My best friend has a male westie. Like you said, not to offend Westie lovers, but those dogs are FIESTY !!!!!!
He is very possessive of his home and kind of run the show. He attacks Oxford when we go to his house(oxford is my reactive one). (shows teeth, hops forward barking and growling). He doesn't do that when he comes to our place. On the leash, he also barks at other dogs. When he has an idea in mind, he will not drop it. pulls, yep, bark...
When we eat at my friend's place, he will bring the toys around because he wants attention, chews his bone right on your lap on the couch.. Oh but if you try to even approach the bone with your hand.. he becomes vicious!
Very possessive over toys, bone, food.
He is very well trained! they went to many classes, he knows loads of fun trick! very bright dog!
Our trainer said that westies in general was the worst LSD in all her classes (LSD = Little Shit Dogs)
and she is not against little dogs! she has many herself! she just calls them LSD
So.. I don;t know if a adding a female westie would be ok.. I'd be afraid she would actually make the boxer miserable...
Oxford actually got mad once at my friend's westie... the westie used to steal all the bones at my place. He used to go around my apartment and collect them in a corner.. and the last one was in Ox's mouth. That didn't stop him. He came, crouched down, from far, and was stalking Oxford's bone... Ox was chewing on it, and George went for it suuppppper fast, growling and snapping towards it to get it.
Well.. Oxford pawed the crap out of him! He didn't hurt him and didn't even used his mouth. But for sure, that scared the westie (and my friend) and he is now even more aggressive towards Oxford.
I didnt' get mad at Ox.. we had been trying to stop the westie's behavior for a long time.. I guess Ox took matter in his own hands (paws)