You found a small bump on your dog and you’re trying to figure out if it’s a tick. The fastest test: ticks have 8 legs, are oval and flat when unfed, and swell up like a balloon when full of blood. Here’s how to identify them with confidence.
The Quick Identification Checklist
Before reading further, run through these 4 quick checks:
- Eight legs? → Likely a tick (or spider, but spiders aren’t attached to your dog)
- Six legs and jumping? → Flea, not tick
- No legs visible at all and soft? → Probably a skin tag
- Hard, oval, attached firmly? → Treat as a tick
What an Unfed Tick Looks Like
A tick that has just attached or been feeding less than 12 hours is flat, oval, and small — about the size of a sesame seed (1–3 mm). It has 8 legs visible near the front (head) end and a hard outer shield. Colour depends on species:
- Blacklegged tick (deer tick) — reddish-brown body, dark/black legs, NO patterned shield. The Lyme carrier in Ontario.
- American dog tick — larger (5 mm), brown body, distinctive mottled grey-and-brown patterned shield (called a scutum) on the back.
- Lone star tick (rare in Ontario) — brown with a single white spot on the back of females.
What an Engorged Tick Looks Like
After 24+ hours of feeding, ticks swell to 50–100 times their original weight. They become:
- Pea or grape-sized (5–15 mm)
- Grey-blue, olive, or pale tan in colour (the original colour fades as the body distends)
- Round and balloon-like rather than flat
- Legs harder to see because they’re under the engorged body
This is the form most owners discover — and most often mistake for a skin tag, wart, or cyst.
Tick vs Skin Tag — How to Tell
This is the most common mix-up. Three reliable distinctions:
- Legs — A tick will have visible legs at the base where it meets the skin. Even on engorged ticks, you can usually spot the legs by gently parting the fur. Skin tags don’t have legs.
- Texture — Ticks have a hard, somewhat brittle outer shell. Skin tags are soft and fleshy.
- Attachment — Skin tags are part of the skin; they’re a continuous tissue with the dog. Ticks are foreign objects firmly attached but distinct from the skin.
If you’re unsure: gently part the fur and look from multiple angles with a flashlight or magnifying glass. When in doubt, treat as a tick and remove with tweezers — there’s no harm in “removing” a skin tag (you literally can’t pull off a skin tag with tweezers).
Tick vs Flea — How to Tell
Both are bloodsucking pests but very different:
| Trait | Tick | Flea |
|---|---|---|
| Type | Arachnid | Insect |
| Legs | 8 | 6 |
| Movement | Slow / stationary | Jumps aggressively |
| Shape | Flat oval | Narrow, side-flattened |
| Attachment | Embeds in skin | Hops on/off |
| Evidence | Stays in one spot | Black flea dirt on skin |
Where on Your Dog to Look
Ticks prefer warm, hidden, hard-to-groom spots. Check these zones after every walk in tick habitat:
- Inside and behind the ears
- Around the eyelids
- Under the collar
- In the armpits
- Between toes and paw pads
- At the tail base and groin
- At the base of the head and neck
Use both hands to slowly run through your dog’s fur, feeling for bumps. Once you find one, separate the fur to look at it directly.
What to Do When You Find One
Don’t panic. See our two complete guides:
Stop Finding Ticks in the First Place
Once you’ve found one tick, you’ll likely find more — they don’t travel alone. The most efficient solution is reducing the tick population in your yard, which is where dogs spend most of their outdoor time. BuzzSkito’s 5-spray season program targets leaf litter, lawn edges, and fence-line zones — the micro-habitats where 95% of yard ticks live. Most customers stop finding ticks within 2 weeks of the first treatment.