Tantus Fido Dildo Onyx (Box)

The Tantus Fido is an XL silicone dildo for experienced anal play. A wide knot in the middle works like a plug, giving a strong burst of pressure as it goes in and comes out, while ribbing on the upper shaft adds texture.

It has 9 inches of insertable length and weighs 15 oz. Tantus makes it in its own 100% silicone, so the Tantus Fido can be boiled or put in the dishwasher.

From Tantus’s product description.

• Warm up with smaller toys first.
• Use a thick lube made for anal play; with silicone toys choose water-based.
• Take the knot slowly and only as far as feels good.
• Stop if you feel sharp pain.

Live prices from our store. Prices updated November 2, 2026.

More on the brand on our Tantus page.

How big is the Tantus Fido?

9 inches insertable. The tip is 1.8 in wide, the ribbed shaft 1.6 in, the middle knot 2.5 in, the lower shaft 1.3 in and the base 2.8 in. It weighs 15 oz.

Who is it for?

Experienced anal players. Tantus calls it an advanced XL toy; the 2.5-inch knot is the widest part.

Can I use it in a harness?

Yes, with an O-ring harness. Tantus says to fold the base down and put the ring around the bottom shaft.

How do I clean it?

It is 100% Tantus silicone: boil it, use a bleach solution, put it in the dishwasher or wash it with soap and water.

Browse all plugs and probes.