I'm starting to think I made a mistake in getting Toby. He's a sweet little lamb, feisty and bouncy, as are more puppies, but my sweet docile Angel has been getting more and more aggressive it seems, especially concerning anything tasty; I've also noticed her aggression peaks during days when I may have spent more attention on Toby than on Angel.
I know these issues take time to work out, so I've tried ignoring it, and when it continued, I tried being right there and correcting her, which works well enough, except that I can't be there at all times. When I'm not there, either my mom is or Toby is in his crate. But today, Toby was with my mom and Angel was loose around them. Everything was well, so I thought it safe to use the loo. I swear, Angel waited for the precise time of my going potty to plan her attack on Toby. She traumatized the poor dear! And I had to pry her jaws apart. Understandably my mom freaked out, screaming and crying, and Toby was shaking and whimpering (but unhurt, thank God).
I don't know what to do. Is it time to seek out a behaviorist? Should I allow for more time? Is there a method to either predict or prevent her behavior? Up until now, while she's been possessive, they've gotten on well, playing and rough-housing, so an unprovoked attack (because there was nothing on the floor or even near Toby to trigger it) tips my perception of events from typical dog behaviors (they'll work it out) to that of something more problematic.
Thank you to all who have suggestions.