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Brüggli 4pets ProLine TÜV approved dog cage Eagle S

RRP: £315.00
Code: BGPL031

4pets ProLine cages are the smartest looking, best designed and best made dog cages that we have seen anywhere.

What makes them even more special is that they've been designed for safety - they've been crash tested and approved by the German TÜV.

This page shows the Eagle S.

4pets ProLine cages are the smartest looking, best designed and best made dog cages that we have seen anywhere.

They're also the first dog crates to have been crash tested and approved by the German testing organisation TÜV SÜD. To our knowledge they are still the only crates to have been approved by TÜV to these standards.

This page shows the ProLine Eagle S, suitable for medium to large dogs, including for example Labrador Retrievers. It's 68.0cm wide, 68.6cm high, and 73.5cm long. If you want to give your dog more space, note that the Eagle M is 83.5cm long, and the Eagle L is 93.5cm long, having measured the length of your car boot from the bottom of the rear seat to the tailgate.

Crash-tested safety: Safety is right at the core of the 4pets ProLine concept, the idea that you’ve done all you can to minimise the risks of injury to your dog when out in the car and, very importantly, to the driver and passengers. The facts are that at 30 mph your dog has a mass that’s 25 times its body weight, so it will be a potentially very deadly projectile in the event of an emergency stop or crash. A typical black Labrador would have the equivalent force of three quarters of a tonne. The majority of wire cages and dog guards are next to useless in these circumstances – they’re designed to separate dogs from people without much if any thought about what forces they’ll withstand; most cages and dog guards are, fundamentally, not designed to keep people safe.

Special features:

  • Shape: ProLine crates are shaped at front and back to maximise the internal space that's available for your dog, so they'll tuck in tight behind the rear seat, be full length of the boot, and still allow the tailgate to be closed.
  • Construction: Anodized aluminium poles, fibreglass reinforced plastic corners with no sharp edges, scratch resistant laminated fibreboard sides, acid resistant plastic floor tray with a removable, washable anti-slip floor mat. Made in Switzerland.
  • Maintenance free: All parts are maintenance free; the hinges are made from a self-lubricating plastic-graphite alloy. They should last for as long as you want them to – years and years. In any event, all parts are replaceable as spares.
  • Ease of use: Single handed ‘slam lock’ system. Opening the door with a twist knob, and then just pushing it shut, means that you can concentrate on holding your dog’s collar. Single handed opening and easy closing is quicker and safer.
  • Good visibility: The vertical bars on both the back and the front of ProLine crates allow the driver particularly good visibility – and being vertical not horizontal also means that dogs can’t easily bite on them.

Dimensions and weight: The Eagle S is 68.0cm wide x 68.6cm high x 73.5cm long; 17.0kg

The crates arrive flat packed, but minimum assembly is required, with typically only 10 bolts to screw in, and they’re satisfactorily easy to put together. Tie-down straps are included.

Accessories: The accessories that are suitable for this cage are shown in the list below.

  • Crash-Bag: Held against the back of the dog box and designed to absorb braking forces.
  • Scratch-Guard vehicle bumper protector: The concertina construction makes it very quick to fold up.
  • Easy-Steps telescoping dog access ramp: A lightweight but immensely strong telescoping dog ramp with a long lasting anti-slip surface. It only weighs 5.4kg, but will hold 100kg. Single handed opening and closing; only 71cm long when closed.
Summary: It’s no surprise that these cages are gaining such a following. Components and build quality are top notch, they look great, and they’re rattle free. Overall they’re very easy to live with - including being light enough to take out of the vehicle relatively easily. When all’s said and done, crash-tested safety has to be the major plus point.


The people at Brüggli in Switzerland who developed the ProLine dog cages are dog owners and enthusiasts as well as design engineers; they therefore set out to create what they hoped would be the safest dog cages anywhere - part of the definition of ‘best’ - without compromising their good looks, functionality, and sensible pricing.

There’s been a lot of discussion in recent years about the dangers of unrestrained pets in cars, although as yet there is no requirement to test and approve harnesses, dog guards or dog cages to any standards. Brüggli realised that to have genuine credibility their ProLine cages (1) would need to meet the internationally recognised benchmarks that apply for example to cargo restraint in commercial vehicles, or indeed to the transport of humans in passenger vehicles, and (2) would need to be independently tested.

Who better to define the standards required than Germany’s TÜV SÜD, the most respected independent safety testing organisation in Europe, perhaps anywhere, who specialise in the automotive sector. The TÜV SÜD programme is very rigorous and, in assessing long term safety, it also needs to take quality, durability and functionality into account.

Each crash test required a ProLine cage to be strapped onto a crash-testing sledge, loaded with a 55kg weight, and then crashed at 50 kph (31 mph) into a ‘wall’ – a similar sort of test to the Euro NCAP crash tests that are done on cars. The measure of success was that the weight would not break through the rear wall of the crate – which is a very tough ask because at this speed an object has a force of over 20 times its static weight, meaning that the cage had to withstand being hit by a weight in excess of 1 tonne! All the ProLine dog cages passed; the TÜV SÜD Certificate no. B 13 01 29106 011 is dated 18th February 2013.

It’s important to note that the TÜV test required the cage to be held in place only with the tie down straps included - there was no additional ‘rear seat’ to absorb any crash forces. When used in a car these straps should be looped through the car’s tie-down rings; it’s also normal for the rear seat to be in the upright position, providing even more protection for the passengers.

As well as crash testing, TÜV also analysed and approved

  • the performance on very rough surfaces – the ‘Belgian block test’
  • the possibilities for deformation
  • the absence of sharp edges and corners
  • the way the aluminium profile end caps protect against injury
  • the type and quality of the bolts and rivets
  • the strength of the connection points
  • the type and quality of the welded joints
  • the locking system
  • the quality of corrosion protection
  • the system for holding the cages in vehicles
  • the labelling, user manuals, and technical documentation

In addition to their TÜV approval, ProLine dog cages comply with the requirements of REACH legislation.

FAQ 1: “Why don’t ProLine cages have an escape hatch?”

Answer 1: This is because, on balance, an escape hatch in the front panel has the potential to do more harm than good. ProLine cages are designed (1) to contain a dog or dogs of up to 55 kg in the event of a crash of up to 50 km/h (just over 30 mph), and (2) to reduce the likely injuries to the dog.

The front panel is arguably the most important part of the cage; it needs to absorb as much kinetic energy as possible.

4pets ProLine use a bespoke laminated fibreboard in their front panel, with only one supporting horizontal aluminium profile. The fibreboard is expected to deform and break if the forces are large enough – the dog will in any event be retained in the cage if the cage is placed behind the rear seat, and the fibreboard will have absorbed much of the energy. If 4pets ProLine engineers only wanted to retain the dog in the cage, they would of course use steel for the front panel!

Note also that there are Crash Bag accessories that can be installed against the front panel, designed to provide additional protection.

The evidence also shows that, in a significant crash, the cage may well be pressing so hard on the rear seat that it’s not possible to use the usual rear seat release catches, in which case an escape hatch would be of no use at all. If the rear seat can be lowered, then the cage can be pulled through onto the rear seat, twisted, and the dog released though the cage door. If it can't be twisted, the fall back is to undo four Allen bolts and remove the front panel - it therefore makes sense to tape an Allen key to the outside of the front panel for use in emergencies.

In summary, 4pets ProLine place the emphasis on energy absorption, for the protection of both humans and pets.

FAQ 2: “Why is wood used in the construction of ProLine cages?”

Answer 2: 4pets ProLine cages use a specially formulated laminated fibreboard in all panels; note that it contains no toxic ingredients. As noted in FAQ 1, it’s chosen because it absorbs kinetic energy in the event of a crash, but it is also much lighter than steel, is free of rattles, and is warm – cars left outside overnight get very cold, and so do any steel cages left inside them!

FAQ 3: “What happens to a ProLine cage in the event of a rear-end collision?”

Answer 3: 4pets ProLine cages are designed to retain their basic shape, which we think is a good thing. Evidence from both testing and crashes at speeds greater than 50 km/h shows that aluminium poles have distorted and fibreboard panels have cracked. In any event, and even in low speed impacts, the dog will have been catapulted into the front panel, wherever it was in the cage at the moment of impact, and whichever way it was facing.

Our understanding of vehicle crumple zones is that most of the energy is absorbed at the front of the vehicle; in a rear-end crash it’s the front of the car that hits yours that should absorb the majority of the energy – if it’s modern, and it’s a car or a light commercial vehicle.

FAQ 4: "What’s the effect on the rear seat back?"

Answer 4: This is a really import question. We assume that it’s predicated on concerns that a large dog, launched from the back to the front of a cage, could break through both the front panel of the cage, and the car seat, and injure a rear seat passenger.

There is evidence from crash testing simulations that this has happened, but only on older seats. Modern rear seats include an energy-absorbing safety panel. Generally, much progress has been made in rear seat construction in recent years, part of a growing awareness of the dangers of unrestrained objects, from power tools to frozen food, bottles and food cans, to luggage, to pets. You will have noted, for example, an increase in the numbers of bulkheads that are fitted to small commercial vehicles as well as to large ones, and that you can buy substantial guards that are placed against the C pillar (above the rear seats) in passenger cars.

4pets ProLine cages must be placed hard against the rear seat – they are shaped to make this both possible and obvious – and they’re designed to absorb a lot of kinetic energy before the rear seat takes the strain.

In summary, if you’re driving a modern car, don’t worry about rear seat strength. It always makes sense to pack solid objects against the seat back - and note that the safest place to carry a frozen chicken is in a 4pets ProLine cage, especially if your dog is at home!

FAQ 5: “Where should the cage tie-down straps be placed?”

Answer 5: This is not really an FAQ, but a note to remind you to tie the straps around the top horizontal side poles, as shown in the instructions, and definitely not around the rear vertical poles that form the door frame, in other words the supports for the door hinges and the door lock.

The reason for this is that, if you tie the straps around the door frame then it’s possible in theory, depending of course on the angle of the straps, the strength of the tie-down points in the vehicle, and the speed of the collision, that the door frame could be flexed enough for the door to open inwards – which is as good as impossible in normal use.

If you have any questions or concerns about anything to do with 4pets ProLine cages, please don’t hesitate to ask.

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Special Offer Deal

Offer Price:

Fitted but not used for real - in very good condition with a few light scuffs and scratches

4pets ProLine dog cage: £284.95 (rrp. £315.00)
4pets ProLine BoxLifter £40.00 (rrp. £50.00)
4pets accessory: £59.95 (rrp. £70.00)
4pets Scratch-Guard: £44.95 (rrp. £53.00)
4pets Easy-Steps: £174.95 (rrp. £200.00)

All our prices include VAT at 20% Total: £284.95
 TÜV testing and approval