Conservation officers are watching three areas in Cranbrook where does have acted aggressively towards dogs.
CO Joe Caravetta said the hot spots are along Hidden Valley Road, near Willowbrook Road, and around 3rd Street South and 9th Avenue South on Baker Hill.
"We've got three areas in Cranbrook where we have been having calls of deer being aggressive. Every one has been with a dog," said Caravetta. "We haven't had any reports of people being attacked by deer."
Fawning season is underway, when does are hiding their newborns until they grow stronger.
"The does are defensive for their fawns until at least the middle of July," said Caravetta. "For about another month they will be very defensive because the fawns are not as mobile. Once the fawns can get up and run as fast as (the doe) can, then typically when they see something, they are going to flee the area.
"It's right now, when the fawns can't run very far and the mother knows that, she is going to have it bedded down in the grass. She knows that her little baby can't run very far, so that's when she becomes defensive."
Does will often hide their newborn fawn in long grass then walk away to feed and keep the hiding spot a secret.
"Quite often people will find a fawn and think it's abandoned but it's really not," said Caravetta.
Does with newborn fawns can see dogs as a threat.
"Its thoughts are that its fawn could be threatened by it. So its natural instinct to protect its fawn kicks in and it pursues the dog," explained Caravetta.
If you are walking your dog in Cranbrook for the next few weeks, have the dog on a leash, instead of running free.
"That's when a dog will more likely be chased by a doe, and the dog will come running right back to you and the doe right behind it," said Caravetta.
It's hard to know on sight if a deer has a fawn.
"The fawn could be off in the grass, behind the doe, hidden, and you may not even see it," said Caravetta.
A doe's behaviour can give the indication.
"Sometimes she will stand her ground. She may paw at the ground. She may droop her head and her ears and posture herself in such a position to be aggressive towards the dog."
Report aggressive deer to the Conservation Officer Service at 1-877-952-7277.