Hi, this is Doctor H and I would be happy to assist you.
Can you tell me what happens when they are together?
Thank you, XXXXX XXXXX please elaborate more on what happened between them? Tilly attacked? Attempted to bite? Were they observed during this time?
What is Bella's age? Are either one of them in heat?
Were they observed during any of this behavior Monday or Today?
What breed are Bella and Tilly? You said there were other dogs in the group, any of them similar in breed, sex, or appearance to Bella?
So bella is the largest?
Has Tilly shown any other aggression towards larger dogs or has she not been around any other ones?
So she's been around other dogs that are larger within the time frame of the aggression towards bella
It could be that she's going into heat pretty soon, but I wouldn't risk it.
This is likely behavioral but it could be medical, although that is less likely.
There has to be a trigger to the aggression - it has to something that Bella is doing to trigger the aggression.
The place that you scheduled the spay - do they do pre anesthetic bloodwork beforehand?
And your mom didn't observe any abnormal behavior prior to TIlly attacking her?
Like you said, there was no food, Bella didn't appear to be guarding her, etc?
Okay, normal behavioral triggers for aggression are going to be objects, food, people, and locations
It could also be that since she's going into heat and Bella is female that Tilly is saying 'back off!' although less likely
If she's going into heat*
Right but sometimes behavior issues start from subtle cues that are unapparent to us
It's not uncommon for a dog to come in for a behavior issue at middle age.
Basically I would recommend some bloodwork to include a thyroid level.
They can tell you if she was on her way into heat or not after the surgery (or before, it the vulva appears enlarged)
I think it's a good idea. Tell him or her the same things you are telling me
Haha, I understand.
It depends, honestly. In the meantime keep them separated.
Does this occur when your mom is giving one of them attention?
Okay. I mean really keep them separated. And after the spay invest in body harnesses (if you haven't already) and a 6' leash (I'm not sure what that is in meters, 1.5?) if you haven't done so already. Each one of you should have a good handle on them.
Then slowly introduce and see how they do. If the aggression persists let me know.
You can respond to this thread or start a new one and request me. I'll schedule a follow up e-mail.
You're welcome, I hope it works out for all of you! Best of luck!
Also you need to close out the chat for me to send you a follow up, just let me know if you have any other questions.