For beasties having trouble with fizzled DoT spells (like Envenomed Breath), the answer should already be in your spell book. At level 17 you got Summon Drink and at level 29 you got Summon Food. (Come on you bought the spell, right?) Every time you log on to your beastie cast until you have a stack on 20 summoned water and 20 summoned food -- just watch your conjuration skill go up. If you have waited until level 35 to begin, you may want to spend a couple hours making bags full of summoned food. You can also practice cast you lower level DoT spells on your pet for skillups. (BTW, the pet will not be hurt by this process so no PETA flamers, please!!)
Luknu Upandown of Stromm -- 35th season Vah Shir Beastlord