Hello everyone. Advice needed asap. My black lab who is now 2 years old used to love playing with other dogs, however over the last 4 or 5 months he has gradually become more weary of them. Instead of running up to them to play like he used to, if we ever see any dogs his tail goes down and he walks really cautiously to them, then while they sniff each other he then becomes aggitated. Then he starts to growl at the dog and sometimes he even chases them away growling. He doesn't bite them but i am worried if i don't do something it might lead to that. The strange thing is, he gets quite nasty and his nose twitches but at the same time his tail wags?? I was told it may be because he was sleeping in our bed and he thinks he is up there with us on the hierachy and he feels he has to protect us so we have stopped him sleeping in bed with us but nothing has changed. He hasn't ever been attacked by one so i don't know why he suddenly doesn't like other dogs!! please help!!