Cannabis sativa (Indian hemp plant). Cannabis resin (hashish) is obtained
from the flowering top of the plant, while the leaves, which are less potent, are
called marihuana, grass or pot.
Animals most affected
Accidental ingestion of cannabis resin left accessible by the pet owners. Possibility
of absorption of the resin by dogs used as drug carriers (canine body packers).
The plant contains several active constituents known as tetrahydrocannabinols, which
act principally as hallucinogens. Toxic doses not well established.
Oral doses in mg/kg:
locomotor ataxia, tremor;
weakness, malaise, occasional excitation;
coma and possibly death.
emetics: apomorphine, sc or im, 0.05-0.l mg/kg;
gastric adsorbents (activated vegetable charcoal).
A 1-year-old poodle had ingested a 1 g piece of cannabis resin. Within 2-3 hours
the dog exhibited ataxia and depression; 12 hours later, and without any treatment,
he improved, although showing minor respiratory difficulties.
A 40 kg 'sniffer' (Customs) dog ingested 2 g cannabis resin. He presented immediately
with vomiting, and one and a half hours later with mild ataxia. The clinical effects
abated several hours later with symptomatic care.