Rat Terrier Mix Breeds

What Are Rat Terrier Mix Breeds?

Rat Terrier mix breeds combine the spirited, intelligent American Rat Terrier with another breed, producing dogs that range from pocket-sized companions to athletic mid-sized partners. Unlike purebred dogs governed by AKC breed standards, these crosses inherit a shuffled deck of traits from both parents — meaning littermates can look, behave, and size up very differently from one another.

The Rat Terrier itself is a farm-bred American original: tenacious, alert, and surprisingly affectionate. Originally developed to hunt vermin and small game, the breed comes in two AKC-recognized sizes — Miniature (10–18 lb / 4.5–8 kg) and Standard (10–25 lb / 4.5–11 kg). When you cross that genetic blueprint with another breed, you get a dog that might be a low-shedding apartment dweller or a high-drive agility star. Predicting which one lands in your living room requires understanding both parent breeds, generation genetics, and the real limits of "designer dog" marketing.

Parent Breed Breakdown: The Rat Terrier Side of the Equation

Before you can predict what a Rat Terrier mix might be like, you need to understand what the Rat Terrier brings to the table. Here's a head-to-head comparison of the Rat Terrier and the breeds most commonly crossed with it:

Popular Rat Terrier Mix Breeds at a Glance

Here are the most common Rat Terrier crosses you'll encounter through breeders and rescues, along with realistic expectations for each:

Jack Chi (Rat Terrier × Chihuahua)

The most widely available Rat Terrier mix. Expect a compact dog weighing 6–15 lb (2.7–6.8 kg) with a bold personality that outsizes its frame. Jack Chis often inherit the Rat Terrier's alertness and the Chihuahua's fierce loyalty to one person. Early socialization is critical — without it, these dogs can develop fear-based reactivity toward strangers and larger dogs.

Rattle / Rattie-Poo (Rat Terrier × Poodle)

Marketed as a "low-shedding" option, the Rattle typically weighs 8–20 lb (3.6–9 kg). Coat type is the biggest gamble: some puppies inherit the Poodle's curly, low-shedding hair, while others get the Rat Terrier's short, shedding coat. Littermates can have completely different coat textures. Only F1B generations (backcrossed to Poodle) offer more predictable low-shedding coats.

Ratgle (Rat Terrier × Beagle)

A sturdier mix at 15–30 lb (6.8–13.6 kg). The Ratgle combines two scent-obsessed hunting breeds, producing a dog with extraordinary nose work ability and a tendency to follow its nose right past your recall command. Best suited for homes with secure fencing — these dogs will dig under or bolt through gaps to chase an interesting smell.

Rat Terrier × Italian Greyhound

A sleek, athletic cross weighing 8–18 lb (3.6–8 kg). These dogs tend toward the Rat Terrier's muscular build with the Italian Greyhound's long legs and deep chest. They're fast — expect 25+ mph sprinting capability — and they feel cold easily, so a fitted dog coat is necessary below 50°F (10°C).

Rat Terrier × Dachshund (Ratshund)

Stocky and low-slung at 10–20 lb (4.5–9 kg). This mix carries elevated risk for intervertebral disc disease (IVDD) from the Dachshund side. Avoid stairs, jumping off furniture, and obesity — all three compound spinal stress.

How Big Will a Rat Terrier Mix Get?

Size prediction in Rat Terrier mix breeds depends heavily on the other parent breed and which size variety of Rat Terrier was used (Miniature vs. Standard). Here's a realistic size framework:

Prediction tip: At 16 weeks, most small-breed mixes are roughly 50–60% of their adult weight. Double the 16-week weight and add 10–20% for a rough adult estimate. For more precision, your veterinarian can assess growth plate closure via radiograph around 8–10 months.

Generation Genetics: F1, F1B, F2, and What They Mean for Rat Terrier Mixes

In practice, most Rat Terrier mixes available through rescues are F1 crosses — the result of accidental breedings or intentional one-off pairings. Dedicated designer-dog breeders producing F1B or multigen litters are rare for Rat Terrier crosses compared to, say, Labradoodles. If a breeder advertises "multigen Rattles," ask for documented pedigree proof. Many claims are unverifiable.

Temperament: What to Expect (and What to Prepare For)

Rat Terrier mix temperament spans a wide spectrum because the Rat Terrier itself is a high-drive, high-intelligence working breed. Here's how traits typically distribute:

Best-Case Scenarios

• Highly trainable — the Rat Terrier's eagerness to work combined with a Poodle's problem-solving ability produces dogs that excel at agility, nose work, and trick training
• Alert without excessive barking — the dog notifies you of visitors but settles quickly
• Affectionate with family members — Rat Terriers are notably "velcro" dogs that bond closely and enjoy physical contact
• Good with children when raised alongside them and when the mix inherits a calmer second-parent temperament (Poodle, Italian Greyhound)

Challenging Scenarios

• High prey drive manifesting as chasing cats, squirrels, or small children running through the yard — this is the Rat Terrier's most dominant inherited trait and appears in the majority of crosses
• Digging behavior — Rat Terriers were bred to go into burrows. Expect yard craters and escape attempts under fencing
• Separation anxiety — both Rat Terriers and several common cross breeds (Chihuahuas, Italian Greyhounds) are prone to distress when left alone for long periods. Dogs left crated for 8+ hours daily often develop destructive behaviors
• Small-dog reactivity — some Rat Terrier mixes, particularly those with Chihuahua genetics, display fear-aggression toward larger dogs. This is manageable with positive reinforcement counter-conditioning but requires consistent effort
• Resource guarding — a tendency that appears more frequently in Rat Terrier × Chihuahua and Rat Terrier × Dachshund crosses. Address early with trade-up games and never punish guarding behavior, which escalates it

The single most impactful thing you can do for any Rat Terrier mix puppy is structured socialization between 8 and 16 weeks of age. Expose the puppy to 50+ novel stimuli — surfaces, sounds, people of different ages and appearances, other vaccinated dogs — using treats and play to build positive associations. The American Veterinary Society of Animal Behavior recommends beginning socialization before the full vaccination series is complete, with appropriate precautions.

Coat Types, Shedding, and the Hypoallergenic Question

Is a Rat Terrier mix hypoallergenic? Not reliably. Here's why:

The Rat Terrier has a short, smooth, single-layer coat that sheds moderately year-round with seasonal increases. When crossed with a low-shedding breed like a Poodle, the resulting puppies may inherit:

• The Poodle-type coat: Curly or wavy, low-shedding, requires professional grooming every 6–8 weeks ($50–$90 per session depending on your area)
• The Rat Terrier coat: Short, smooth, moderate shedding, low-maintenance — a weekly rubber curry brush session is sufficient
• A mixed coat: Wiry or broken-coated texture with moderate shedding and occasional matting behind the ears and in the "furnishings" (longer hair on legs and face)

In an F1 litter, you can expect roughly a 50/50 split between coat types. There is no way to guarantee a low-shedding puppy from an F1 cross. If low shedding is a priority, seek an F1B Rattle (75% Poodle genetics) or consider a purebred Poodle instead.

Regarding allergies: No dog is truly hypoallergenic. Dog allergies are triggered primarily by Can f 1 protein found in saliva and dander, not by hair itself. Low-shedding dogs produce less airborne dander, which helps some allergy sufferers — but individual human responses vary enormously. Spend at least 2 hours with the specific dog before committing.

Health Considerations: Hybrid Vigor vs. Reality

Let's address the most persistent myth in designer dog marketing: that mixed breeds are automatically healthier than purebreds due to "hybrid vigor." The Merck Veterinary Manual acknowledges that outcrossing can reduce the incidence of recessive genetic disorders that are concentrated within closed breed populations. However, mixed-breed dogs are not immune to inherited conditions — they can inherit health risks from either parent breed.

Conditions Inherited from the Rat Terrier Side

• Patellar luxation (kneecap dislocation) — prevalence estimated at 5–10% in small terriers. Grades I–II may be managed conservatively; Grades III–IV require surgical correction ($1,500–$3,500 per knee)
• Cardiac conditions — particularly mitral valve disease in later life. Annual veterinary cardiac auscultation is recommended from age 5 onward
• Allergies (atopic dermatitis) — environmental and food allergies are common in Rat Terriers, causing chronic itching, ear infections, and paw licking. Management is lifelong and may involve Apoquel ($70–$120/month) or Cytopoint injections ($65–$130 every 4–8 weeks)
• Demodectic mange — an immune-mediated skin condition caused by Demodex mites, more common in young Rat Terriers with immature immune systems

Conditions Inherited from Common Cross Breeds

• From Chihuahua: Tracheal collapse (use a harness, never a collar for leash walking), hydrocephalus, dental overcrowding
• From Poodle: Progressive retinal atrophy (PRA), Legg-Calvé-Perthes disease (hip joint degeneration in small breeds)
• From Beagle: Intervertebral disc disease, epilepsy, cherry eye
• From Dachshund: IVDD — lifetime risk estimated at 19–24% in Dachshunds and their mixes. Maintain lean body condition (body condition score 4–5 on a 9-point scale) and provide ramps instead of allowing furniture jumping
• From Italian Greyhound: Leg fractures (thin bone structure), periodontal disease (crowded small mouths), cold sensitivity

Grooming Needs by Coat Type

Grooming requirements for Rat Terrier mix breeds depend entirely on which coat they inherit. Plan for either scenario:

If Your Dog Inherits the Short Rat Terrier Coat

• Brush weekly with a rubber curry brush or grooming mitt (5 minutes)
• Bathe every 6–8 weeks or as needed — over-bathing strips natural oils from short coats
• Clean ears weekly — erect or semi-erect ears are less prone to infection than floppy ears but still need monitoring
• Trim nails every 2–3 weeks — overgrown nails alter gait and can cause joint stress
• Daily tooth brushing — small breeds are disproportionately affected by periodontal disease; by age 3, an estimated 80% of small dogs show dental disease signs

If Your Dog Inherits a Curly or Wavy Poodle-Type Coat

• Brush every 2–3 days with a slicker brush and metal comb to prevent matting (15–20 minutes per session)
• Professional grooming every 6–8 weeks — budget $600–$1,100 annually
• Check and clean ears weekly — hair-growing-in-ear-canal breeds need ear hair plucked or trimmed to prevent moisture buildup and infection
• Same nail and dental care schedule as above

If Your Dog Inherits a Broken or Wire Coat

• Hand-stripping or clipping every 8–12 weeks
• Brush 2–3 times weekly — wire coats trap debris and burrs, especially after outdoor activity
• Pay special attention to furnishings (leg and face hair) where mats form quickly

Exercise and Training Requirements

Rat Terrier mixes are not couch dogs. Even the smaller crosses need structured daily activity to prevent boredom-driven destruction. Here's a practical exercise framework:

• Minimum daily exercise: 45–60 minutes, split into two sessions. A 20-minute sniff walk (allowing the dog to explore and smell at its own pace) plus a 25–30 minute structured activity session
• Structured activities: Agility, barn hunt (a sport specifically designed for terrier-type breeds), lure coursing, nose work, or trick training sessions
• Mental stimulation: Food puzzles (Kong Wobbler, Outward Hound Nina Ottosson puzzles), frozen enrichment toys, scatter feeding in the yard. A mentally tired Rat Terrier mix is a well-behaved one
• Off-leash caution: The prey drive in these crosses means recall is unreliable in unfenced areas with wildlife. Invest in a 20–30 ft long line for safe off-leash exploration, or use secure sniffspot-style private fenced areas

For training, use only positive reinforcement methods — food rewards, toy play, and praise. Rat Terriers are sensitive dogs that shut down under harsh correction. If you're struggling with leash reactivity or resource guarding, work with a certified professional dog trainer (CPDT-KA or IAABC-credentialed) who uses force-free methods. Expect to pay $75–$150 per private session.

Cost: How Much Does a Rat Terrier Mix Cost?

First-year total budget estimate: $1,500–$4,000 depending on acquisition source, coat type, and whether any health issues arise. Ongoing annual costs after year one typically run $1,200–$2,500.

Rat Terrier mixes are moderately available through breed-specific rescues such as the Rat Terrier Club of America's rescue network and general small-breed rescue organizations. Puppies from breeders are more commonly found in the Midwest and Southern US, where Rat Terriers have deeper roots in farming communities.

Who Is the Ideal Owner for a Rat Terrier Mix?

These mixes suit specific lifestyles better than others. Here's a decision framework:

Good fit if you:

• Have prior experience with terriers or high-drive small breeds
• Can commit to 45–60 minutes of daily structured exercise plus mental enrichment
• Have secure fencing (minimum 5 ft / 1.5 m for athletic crosses; 4 ft / 1.2 m may suffice for Chihuahua mixes)
• Work from home or can arrange midday visits — these dogs struggle with 8+ hours of isolation
• Have older children (8+) who understand how to interact gently with small dogs
• Are interested in dog sports — these mixes excel at agility, barn hunt, and nose work

Poor fit if you:

• Want a low-energy lap dog that's content with a 10-minute potty walk
• Have cats, rabbits, or other small pets (prey drive risk is high and often unmanageable)
• Live in an apartment with thin walls and noise-sensitive neighbors (these dogs bark at stimuli)
• Cannot commit to consistent training and socialization during the first year
• Want a predictable, guaranteed outcome in size, coat, or temperament — adopt a known adult dog instead

Frequently Asked Questions About Rat Terrier Mix Breeds

What two breeds make up a Rat Terrier mix?

A Rat Terrier mix is always one part Rat Terrier and one part another breed. The most common pairings are with Chihuahuas (Jack Chi), Poodles (Rattle), Beagles (Ratgle), Italian Greyhounds, and Dachshunds (Ratshund). The specific cross determines the mix's likely size range, coat type, and temperament tendencies.

How big will my Rat Terrier mix get?

Most Rat Terrier mixes fall between 6 and 30 lb (2.7–13.6 kg) depending on the other parent breed. Chihuahua crosses trend toward 6–15 lb, Poodle crosses toward 8–22 lb, and Beagle crosses toward 15–30 lb. Use the 16-week weight doubling method for a rough estimate, and consult your veterinarian for a more precise projection.

Are Rat Terrier mixes good with children?

They can be excellent with respectful, dog-savvy children aged 8 and up. Younger children often handle small dogs too roughly, which can trigger fear-based nipping. Always supervise interactions and teach children to never disturb a sleeping or eating dog.

Do Rat Terrier mixes bark a lot?

Moderately to frequently. Rat Terriers are alert dogs that vocalize at doorbells, passing dogs, squirrels, and unusual sounds. Chihuahua crosses tend to bark more; Poodle crosses may be slightly quieter. Consistent training can reduce nuisance barking but won't eliminate it entirely.

How long do Rat Terrier mixes live?

Most Rat Terrier mixes live 13–18 years, benefiting from the small-breed longevity advantage. Maintaining lean body condition, providing regular dental care, and keeping up with preventive veterinary visits are the three most impactful things you can do to maximize lifespan.

Can Rat Terrier mixes live in apartments?

Yes, with caveats. They need daily outdoor exercise and mental stimulation to prevent destructive boredom behaviors. Barking may be an issue in buildings with shared walls. A Rat Terrier × Chihuahua mix adapts to apartment life more easily than a Rat Terrier × Beagle, which needs more space and outdoor access.

Where can I find a Rat Terrier mix to adopt?

Check the Rat Terrier Club of America rescue network, Petfinder.com (filter by Rat Terrier mix), and local small-breed rescue organizations. Breed-specific rescues often have foster-based evaluations that give you accurate temperament information — a significant advantage over shelter adoptions where dogs may behave differently in a kennel environment.