I have 3 dogs; Honey (Female, ~9yrs old, Shepard/Bull Terrier Mix), Nick (Male, ~4yrs old, Lab Mix) and Mo (Female, 1yr old, Cattle Dog/St. Bernard mix). We rescued them all at different times. Mo is our newest and she has been with us for about 7 months. She was much smaller, but now is almost as big as Honey. The problem we have is fighting between Mo and Honey. It has only happened a couple of times and it happens either when someone is at the door or the last time (which required Honey to get stitches) in our backyard over a toy. Since that happened (beginning of December) my husband and I have been researching and begun training all three (they all need it).
While I have read many times, that training won't necessarily help with the fighting, we needed to do it. I have read that there needs to be an hierarchy to their pack that we can reinforce properly. We definitely know that Nick is low man on the totem pole, but it is harder to decipher who, between Mo and Honey, is the top dog.
While it seems that Honey would be the leader due to her size (about an inch higher and about 10 pounds heavier) due to some of her behavior (Mo wont look at her in the eye and will not walk by her unless there is plenty of room), Mo is also showing signs of being the top dog (she is the first dog through all doors).
I have read that we need to let them work it out themselves, however in the last fight, it took about 5 seconds of fighting before I separated them (pull Mo by her back legs to get her to detach her teeth from Honey's legs) and the damage was done. I don't feel that I can stand by and see the two of them fight it out, because I think they would literally kill one another. Also, Honey has recently broken her canine teeth, so I think that Mo's wounds would kill Honey.
What can I do besides let them 'figure it out' by fighting to find out who is the dominant dog so we can properly reinforce their hierarchy.
Luckily, they are responding well to training and their is no aggression towards my husband and I (we have no kids in the house hold).
Also, both Mo and Honey seem to get along 99.9 % of the time. (Nick and Mo are crated durng the day and Honey has run of 1/2 of the house when we are gone).