(Calgary, AB, Canada)
Sara is an english bulldog with very long legs, she is approx 50 pounds and large, she was fixed at 6 months and she will be two in december, we got her at 8 weeks and at that time already had a 6 year old pug "Shae", they got along famously until Sara got taller than Shae, then Sara would fight if I (Lee) was in the room, and I dont mean squabble Sara would attack Shae by getting her in a corner and standing over her and biting. My daughter (Maddie) moved out with both dogs two months ago and they lived together fine with only two fights in a month, but Shae became "depressed" so she came back to live with me about 3 weeks ago, since then Maddie has brought Sara to visit approx 4 times and each time as soon as Sara enters the house her back stands up and her ears go down and she immediately focuses on Shae (who will not even look at Sara anymore, and actually looks terrified)and Sara attacks, even with a muzzle on Sara still attacks.
We now have a small pomeranian who is 4 months old, and so far Sara just plays and tumbles with her and has not made any aggressive move towards her. Yesterday, Maddie took Sara to a friends house who have 4 dogs (3 small and one puppy) Sara has always played with them with no problem, but yesterday when she saw the puppy "kiko" (gonna be a large dog)she immediately attacked (kiko is almost as big as Sara now, but he is very timid)the three smaller dogs stayed off her radar and she ignored them only wanting kiko. Sara is not aggressive to people at all, just dogs half her size and bigger.