Why
Adult dogs and cats digest lactose poorly, and the sugar and fat raise the risk of obesity, dental problems and pancreatitis. Chocolate, coffee, macadamia and rum-raisin flavors are toxic in their own right, and sugar-free ice cream may contain xylitol. A lick of vanilla isn't an emergency, but don't make it a habit.
How to give it / if eaten
If you'd like a frozen treat, use pet ice cream or a small amount of frozen plain yogurt or banana. With human ice cream, check for chocolate, coffee, nuts, raisins and xylitol, and stop at a lick or two. Keep treats under 10% of daily calories.
Watch for these signs
Diarrhea, gas and vomiting are typical. After chocolate flavors watch for agitation and a racing heart, and after sugar-free ones for weakness and wobbling, and call your vet right away if they appear.
FAQ
My dog had a little vanilla ice cream. Is that okay?
A lick or two is usually fine, though it may cause diarrhea. If it was sugar-free, check the label for xylitol.
Is dog ice cream safe?
Pet ice creams are made with less lactose and no toxic ingredients, so they're much safer than human versions. Still treat them as treats and watch the portion.
General information only. Weight, age and health conditions change how a pet reacts, so ask your vet if you are worried.