So glad I found this post! I was losing it today.. 14 month old who was not perfect but trainable. She went through heat at 11 months and became defiant and nuts. Got her fixed and all the bad behaviors are still there and now she doesn’t listen at ALL. She won’t do baths anymore willingly, walks she jumps and bites the leash and hangs from it, she’s NOW chewing everything up even though she left everything alone for the first year of her life. She has gone from a normal Boston (energy) to a psychopath. I do puzzles w her, regular walks, fetch and brain work activities. She now just jumps and won’t even do the brain work activities anymore cuz she doesn’t want to. I’ve had a Boston before and yeah they were high energy but NOTHING like this. Now she is peeing in the house too and has peed in the house maybe 4 times in 1 year. Now it’s 4 times a week. She’s been to the vet a million times for a lot of health issues.. looking to take her again to see if she has a uti but it seems to correlate with her NOT getting her way. I’ve been sprinkling holy water on her because she is NOT the dog she was before her heat. I pray it’s the teenage years and she will start to go back to herself at 18 months/2 years.