The blazehound has three stages of growth - baby, adolescent, and adult. It will take approximately 15 hours to reach the adolescent stage and an additional 25 hours to reach the adult stage. This time can be halved by "playing" with your pet by making it do one of its two emotes. It appears that while the pet is with you, it generates its own pet points up to a cap of 30 points. When this cap is reached, simply making the pet do an emote will allow you to retrieve the generated points, making it possible to raise the pet in half the time.
Although the blazehound does not need to be fed like normal pets, feeding it a Tasty Treat will increase the rate at which it grows by 50%, and feeding it a Jelly Treat will increase it by 100%.
Similar to SummoningFamiliars, the blazehound has abilities. It has the ability to forage for random items, the ability to scavenge loot from slain enemies, and is periodically able to deposit an item to its owner's bank.
Legendary pets have several unique abilities, described below. Pets in the baby stage can have one active ability, adolescent pets can have two, and adult pets can have three. Abilities can be switched out at any time unless that ability is on cooldown. Active abilites are switched via the pet interface by clicking on the "Abilities" button at the bottom right corner.
Life saver, slayer finisher, repair item and fertiliser are not available for Ironman accounts.
The pet can randomly forage items when they are summoned. This can also be triggered actively. The foraged item is always one of the following:
The pet is able to take an item to your bank; they can take one item every 10 minutes, and a stack of noted items are banked all at once. The pet's ability to bank does not work beyond level 1 Wilderness. If one just crosses the Wilderness wall (and the Wilderness level display does not actually appear; thus can be considered "Wilderness level 0") and does not walk north, then the pet's banking ability still can be used.
The pet is able to scavenge dropped items from the moment it is obtained. To access the scavenge feature, 'Interact' with the pet and select 'Convenience', then select 'Scavenge'. When scavenge is selected, a menu interface will appear; the pet will automatically collect charms, but is able to pick up other items too. You can make the pet scavenge: Gold, Runes & Talismans, Herbs & Seeds, Weapons, Armour, Metal Bars & Ore, Bones & Ashes, Raw & Cooked food and Miscellaneous.
The pet will only pick up one item from a slain enemy; if an enemy drops two or more items, the pet will only pick up one. The pet will not always pick up items after a kill. There is a chance that the item picked up by the pet will appear in your bank rather than being in your inventory.
To deactivate scavenge, 'interact' with your pet, select 'convenience' and select 'Heel'.
Your pet will save you from death, as per a ring of life. Note that this does not work in PvP areas and has a two-hour cooldown (logged-in time).
Your pet will automatically finish off Slayer monsters that usually require an item, saving you an inventory slot.
Once per hour, you can use a repairable degrading item on your pet to repair it immediately. This works – and costs – the same as using the POH armour stand.
Beast of Burden
Using a Beast of Burdenfamiliar pouch on the pet allows it to act as a version of that beast with the same time limit. Using multiple pouches on the pet lets you extend the time up to two hours. Unlike most Beasts of Burden, legendary pets do not use summoning points. An update on 14 September 2015 established their life points at 10,600. As such, they can be killed in PvM situations.
High Level Alchemy
Once per 10 minutes, use an item on your pet to convert it to coins, as per the High Alchemy spell. This requires 55 Magic, but does not need runes and gives no experience.
The Blazehound Puppy is able to do two emotes which both look similar - 'Can't Pet This' and 'Play dead'. As said earlier they can increase the growth rate of the puppy but repetitively doing them is useless as after two to four times it will stop giving you pet points. It is a lot more beneficial to do it with intervals, of, say, 10 minutes perhaps to gain the maximum pet points.
The Blazehound Adolescent has two new emotes - however, it does not retain its old ones. One of its emotes is 'Fetch' - where your player throws something behind the blazehound and it turns to get it. The other emote, 'Stop, Drop and Roll', makes your pet go still for a moment, then drop to the ground and finally roll onto its side. A few moments later it gets up.
Following the pattern, the Blazehound Adult has another two new emotes - although it is unable to perform its previous four. 'Dog-eat-Goblin' is one of its emotes - where a goblin appears and then the Blazehound Adult seems to turn it to black ash then eat the remains. The second emote is named 'Hot Dog' where the Ground around it cracks so you can see something that could be referred to as magma in the ground. Four tall, thin spurts of flame shoot out around the Blazehound from the ground. Neither of these two emotes give any pet points however - seeing as your pet is fully grown there is no reason for it to have pet points any more apart from the fact that you can tell how long someone has had a pet by checking their pet's pet points.