My horse is now 21 days pregnant (yey!) However, being an Alpha mare she can be rather dominante if allowed to be. I think it must be hormones combined with being intragrated into a new herd. She has taken the herd leader title off the chestnut mare, seems to have established a good pecking order with the horses, however, apparently this extends to handlers.
When she is lead too/from the field she is becoming bolshy, rearing and striking out her front leg at the handlers and trying to drag them back to the field. There is no malice, its just typical alpha behaviour. I am a bit firmer with her then mum (more experienced) and I knock it on the head as soon as it starts.
Do you think its the pregnancy? Surely its too early for significant changes in behaviour (docile puppy dog to lead mare) or just a number of factors?