Is basil toxic to dogs or cats?
Safe in the amounts any dog would eat.
Safe for cats; some enjoy a nibble.
Basil is safe for both species, so the windowsill herb garden can stay. As with any strong herb, quantity brings diminishing returns and possibly a mildly upset stomach. Pesto is a different question: it is the garlic that disqualifies it.
Signs to watch for
- None in normal amounts
Sources: ASPCA toxic and non-toxic plant list, Pet Poison Helpline. Verdicts are conservative by design: where evidence is thin we choose the stricter rating.
This is general educational information, not veterinary advice. When in doubt about your own pet, ask your veterinarian.
If your pet just ate something risky, act now: call your vet, ASPCA Animal Poison Control at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661 (consultation fees may apply).