thank you i didnt know that.never had this problem with my other dogs. but will try that and see what happens

got a pup at 16 weeks and has been in same pen 25x50 with 4 dogs for 2 years. she came in heat about 2 weeks ago and has now become (very)agressive to 1 of the dogs and has penned her in corner( several times) and just used her as chew toy have had to grab her collar and whip her just to get her to ...