I have an 13 year old rescued labrador cross bitch (Molly)who is a gentle old lady. In March we brought home a lurcher bitch puppy (Lottie). Initially the two dogs got on brilliantly - they would curl up together, chase after each other and were partners in crime! Lottie was abandoned at a very early age and obviously had no social skills passed on from her mother. Molly was very patient and a very tolerant teacher. Lottie loves to play fight and occasionally gets too rough. Molly will snap at her and until recently Lottie has run off and hidden under the table. This week things have changed. We have had 4 nasty dog fights. It started with a play fight, Molly would snap and then Lottie would launch herself at Molly's throat. Yesterday she tore a chunk of fur from her and would not let go. I had to pull her jaws appart to release her. Molly has become very depressed and will not interact with anyone. She is scared of Lottie and tries to avoid her. Lottie wants to play as normal. Molly is an old girl with a heart murmur and is obviously the weaker of the 2. They are both now similar sized. As a temporary solution Molly has gone to stay with my mother in law (she often goes there on her holidays so she is used to it). I feel terrible- that I have betrayed this lovely gentle old dog. Can any one tell me whether they think this situation will get better over time? I really don't want to lose either dog but similarly I don't want to cause Molly suffering in her retirement years. Thanks for reading this long post!