Hi there, I have a 20 week old Jug (jack russell/pug cross). Took her to a playground at the weekend where there were quite few birds and she kept lunging at them - really hard. She became quite hard to control and wound up barking at dogs too - which is not like her as she is usually such a friendly pup. She occasionally does this when out walking too but not often/always.
Any tips on how to get her to stop doing this?