Bromethalin-containing rodenticides are toxic to all animals, especially cats. Toxicity mainly occurs due to cerebral edema. It’s important to note that anticoagulant rodenticides also have a risk of toxicity if ingested.

Signs and symptoms of toxicity: Clinical signs of toxicity in dogs include weakness, paralysis, tremors, seizures, and coma. Cats are more prone to show paralytic signs of toxicity.

Toxic consumption: In dogs, ingestion of 2.5 mg/kg (1.1 mg/lb) of bromethalin can be fatal. In cats, the toxic threshold is lower at 0.45 mg/kg (0.2 mg/lb).

Dogs: Bromethalin Toxic Consumption
X-Small Yorkie, Chihuahua	Small Pug, Boston Terrier, Poodle	Medium Beagle, Scottish Terrier	Large Boxer, Cocker Spaniel	X-Large Retriever, German Shepherd	XX-Large Great Dane, St. Bernard
1 – 10 lbs. (0.45 – 4.6 kg)	11 – 25 lbs. (5 – 11.4 kg)	26 – 40 lbs. (11.8 – 18.2 kg)	41 – 70 lbs. (18.6 – 31.8 kg)	71 – 90 lbs. (32.3 – 40.9 kg)	91 – 110 lbs. (41.4 – 50 kg)
> 1.1 mg	> 12 mg	> 29 mg	> 46 mg	> 80 mg	> 103 mg

Cats: Ivermectin Toxic Consumption
Most Cats	Large Cats
1 – 10 lbs. (0.45 – 4.6 kg)	11 – 25 lbs. (5 – 11.4 kg)
> 0.2 mg	> 2.2 mg

References:
Osweiler, G, et al. (2011). Blackwell’s five-minute veterinary consult clinical companion. Small Animal Toxicology. [Kindle version]. Retrieved from Amazon.com